The engine build will be discussed in two parts. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. A total of 1,808 Ram Air IV production cars were built over its 2-year production. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14]. 1969 - 400 Ram Air III Code 62. Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. Pre-Owned. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. Torque: See Part 2 This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. In 1970 the casting number #9799914 Ram Air 400 4-bolt main block also used the 4-bolt main caps on Ram Air applications. Math, not gasoline, makes horsepower under the hood of a Pontiac. The 421 badging was standard on the 2+2, the 421 H.O. Forged steel 6.625in (168.3mm) rods (Ram Air V style), Large-valve heads (valve diameter): 2.4in (61mm) intake, 2in (51mm) exhaust, Small-valve high-RPM head (valve diameter) 2.19in (56mm) intake, 2in (51mm) exhaust. 1965 Pontiac LeMans GTO Mecum. 5 January 2007. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Here are features on more than 100, Muscle cars created their own culture. 10 with 308/320 degrees of duration and 0.445/0.447-inch lift (11.3/11.4mm) with 1.65:1-ratio rocker arms and solid lifters, special #529238 forged-steel connecting rods, forged aluminum 4.09-inch (104mm) bore Mickey Thompson pistons, #542990 forged-steel crankshaft with a 4-inch (101.6mm) stroke and 3+14-inch (82.6mm) diameter main journals. Compression Ratio: 10.6:1 effective Piston pins: Icon, SAE 1016 to 1022 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Update your shipping location. First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. Maximum flow at 28 inches of water [citation needed]. Email Email. Both of these engines were originally dealer-installed options, but since the NHRA moved to limit racing eligibility to factory-available options on cars available to the public, Pontiac made the SD 421 a factory option for 1962, and most of the approximately 164 SD 421 engines were installed in the Catalina, with another 16 being installed in . View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. Preparation: File-fit for end gap if needed, wash Deck Height: 10.215-in Make way for one of the baddest muscle cars of all time, the, An all-aluminum, race-proven V-8 defined the rare and wicked, The engine is what gives a muscle car its flamboyant personality. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. Block casting # 9773157. Besides a variety of displacements, the Pontiac V-8 block saw a number of other changes over the years, including starter locations, main-journal diameters, engine-mounting points, and . Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. In the Firebird Ram Air induction for the 400 HO was a separate option for 1969(included with Trans Am) and included with the engine(optional in Formula; included with Trans Am) in 1970. The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. Here are my top six rationales for admiring the 1966 GP. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. The 1966 Pontiac Ventura doesn't necessarily come up when speaking of 60's muscle cars, but the type of V-8's offered with the Ventura meant plenty of power. Most Pontiac engines like total timing (rev engine past 3000 or so until the mechanical advance stops moving/advancing, vacuum advance disconnected to check total timing) somewhere between 32 and 36 degrees. "1966 Pontiac 2+2" Pontiac ignited the classic muscle car era with a stroke of marketing genius. 3.75. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got 1.96in (49.8mm) intake and 1.66in (42.2mm) exhaust valves and pressed in rocker arm studs. Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . Year. The four-barrel 400 was a popular performance option for many of Pontiac's cars. Open pressure: 282 pounds at 1.100-in Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only. The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Math, not gasoline, makes horsepower under the hood of a Pontiac. 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. Oil pump: . In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. [19], Parts for Ram Air V engines are not readily available. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The next 1 or 2 numbers represent the date, and the last number is the year. The engine was available in all full-size Pontiacs. Where else will the extra 100 horses come from? designs, the SD-455 was a much improved engine. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. Ever wonder what it would take to increase that number by 100? These same heads were also used on the 1964 GTO 389 tri-power engines. To determine horsepower from airflow, invert the equation: The 421SD was available in 1961 as a dealer option or over the counter then in 62 and 63 from the factory, and was fitted with a list of internal modifications designed solely to withstand the abuse of drag racing. Oil pan: 8-quart with extended pick-up, fabricated retention clamp In 1967, the Pontiac 2+2 became an option on the . Pontiac Engine Torque Specifications. In the 1960s the popular 389cuin (6.4L) version, which had helped establish the Pontiac GTO as a premier muscle car, was cut in half to produce an unusual, high-torque inline four economy engine, the Trophy 4. It added '421' engine badges on the front fenders, 2+2 insignia on the deck lid and rear fenders, and simulated louvers behind the front wheel cutouts. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. The Fresh Air package continued into the 1966 model year. Also bowing in 1967 was the new Firebird, which had the . The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. Method used to retain pins in pistons: . [22]. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. This may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. The first letter equals the month. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Coil: GM Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 In 1968, there was also a 350 "HO" which had increased power with the addition of higher compression #18 heads (#17 and #46 were the most common 2-barrel heads), a four-barrel carburettor and matching intake that was also used on the 400 and 428 engines. Casting No. This was a project started with the end goal of building a 427 Hemi. Vacuum advance: Not usedEXHAUST Like the 326, it was offered in both 2-barrel and 4-barrel versions. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW). Tri Power engine however was optional. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. The engines feature a cast-iron block and head and two valves per cylinder. Boost was wastegate limited to 91psi (0.6210.069bar). For 1967 only Pontiac called this engine the Quadra-Power 428. Length: 8.750-inCAM cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. Along with proper parts selection, accurate machining and assembly are also important. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. Both used a single two-barrel carburetor. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. Head ID Location This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . 1968 - 400 Ram Air II Round Port Code 96. The 1969 HO 350 HO was equipped with the 400cuin (6.6L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330hp (246kW). The 287 was an "oversquare" engine with a bore and stroke of 3+34in 3+14in (95.3mm 82.6mm), for a total displacement of 287.2cuin (4.7L). Jim told HPP, "Since I was a young man in the '60s, I always thought how great it would be to find a true 100hp in a legendary 421 Tri-Power setup that retained its iron heads and intake. Standard in the Firebird Trans Am, it was still a rare engine. Pontiac V8 Engine Tune-Up and Torque Specifications. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. The 1975 455 HO package received some negative press/reviews as some buyers expected to see a return of the 1971-1972 engine, and were disappointed when they received the lower output motor. Simply put, what good is the power if the engine does not last? Engine Specifications. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. Ellingson Motorcars (877) 638-7170. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. Maximum RPM (high-RPM engine): over 8000 rpm, Engine weight: estimated 550lb (249kg) complete, Power: estimated 640hp (477kW) at 7500rpm, This page was last edited on 30 January 2023, at 13:15. 1966 Pontiac GTO. The 421 Super Duty had been the first of these, and their large bore and stoke made them popular in NHRA and NASCAR competition throughout the '60s. Lift: 0.515/0.525 with 1.6:1 rockers The camshaft was the HO cam with 288/301 duration. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. As with all other Pontiac V8 motors that evolved from the 316 V8, the 421 was simply a bored out and stroked version of the popular Pontiac 389 V8. Pushrods: LPC chrome moly An HO version could be ordered in the GTO, as GM had lifted its restrictions on offering engines larger than 400cuin (6.6L) in mid-sized cars (resulting in the 454 (7.44) Chevrolet Chevelle, Starting at the bottom, Jim will employ lighter and stronger parts in the reciprocating assembly, as evidenced by the choice of Howards billet rods and forged Icon pistons. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. [8] All of these improvements provided the W72 with a power rating of 200hp (203PS; 149kW) at 3600 rpm and 325lbft (441Nm) of torque at 2400 rpm, while the standard L78 400 only produced 180hp (182PS; 134kW) at 3600 rpm and 325lbft (441Nm) of torque at 1600 rpm. At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance. Lobe separation angle: 112-deg In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). The cylinder heads on the 400 CID version had an intake port volume of 290cc (17.70cuin), nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of 315cuft/min (8.9m3/min) @ 0.8in (20mm) valve lift; in the realm of the NASCAR-dominating Chrysler 426 Hemi. Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. VEHICLE TYPE . The 326 subsequently became the optional V8 engine for Tempests, and later the Pontiac Firebird, through 1967 and maintained the 17 degree cylinder head valve angle for its entire production run. . The 428 was increased to 456.12cuin (7,474cc) in 1970. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . An evolution of the RA IV and H.O. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. It tips the scales at 3,950lbs. Exhaust: 180 cfm at 0.500-in On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Also added was the #48 casting number heads with a 68cc (4.15cuin) chamber for higher compression, along with larger 2.11 and 1.77in (54 and 45mm) valves. But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Read. 1967 was the last year for closed-chambered heads. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. Size cfm: Total flow, 1,050 cfm The V8 engine was introduced for the 1955 model year as the "Strato Streak". It had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. Pontiac introduced the OHC 6 in two flavors for '66: a base engine with a one-barrel carburetor that developed 165 hp at 4700 rpm, and a sportier version with a 10.5:1 compression ratio, a high-lift cam, a split exhaust manifold, and GM's new four-barrel Quadrajet carburetor (below). Collector size: 3.00-inGASKETS It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. The engine compartment of this concours Catalina is beautifully finished. The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. Ram Air induction was optionally available with the 455 HO in the Firebird Formula(standard on Trans Am), GTO (standard with "The Judge" package), and 2-door LeMans Sport when the T41 Endura Styling Option was also ordered. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. Engine Displacement: 432 ci Along with proper parts selection, accurate machining and assembly are also important Known as GM's performance-oriented division, Pontiac lived up to the hype by creating the first Muscle Car and kicking off the Muscle Car era. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. The four-barrel version, set up for sustained high speeds, had 390 hp. 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). Still, it was the strongest American engine offered that year. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Cam was a #541596 McKellar No. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. A three-speed stick was standard; a four-speed and automatic cost extra. Ram Air induction was optional in the GTO, though power ratings were unchanged. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. The heads were a new design featuring siamesed intake ports. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish The earlier 1975-78 blocks had metal shaved from the journals and bottom end as well as a decrease in the nickel content of the block in an attempt to decrease the overall weight of the vehicle to help alleviate emissions and cost. All 1980 Trans Ams received this engine as standard with the option to delete this engine choice as a credit option for the standard L37 301. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . Headers: Hooker Super Comp (for dyno test) Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. HP = flow at 28 in/H2O x 0.257 x # of cylinders. Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 . 400 Ram Air (1969) / Ram Air (1970), aka Ram Air III, Learn how and when to remove these template messages, Learn how and when to remove this template message, "Tested: 1968 Pontiac GTO 428 / Royal Bobcat", "1969 Pontiac Grand Prix 428 specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight", "Muscle Car Horsepower How Exaggerated Was It? Neither casting was equipped with an exhaust crossover. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. Sponsored Stories . aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Factory heavy-duty high-pressure oil pump and eight-quart sump, four-bolt main bearing caps with Moraine aluminum bearings, and #1110976 dual-point distributor without vacuum advance. However, a few dealers would offer them in the GTO or Firebird and do their own installations, such as Royal Pontiac who offered the "Bobcat" conversion. The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Plans were made to produce Firebirds and GTOs with advertised ratings of 355hp (265kW) and 375hp (280kW) respectively but concerns about emissions, the response of the automobile safety lobby, and the warranty implications of a high-revving street engine led to cancellation of the program.[why? The 338-bhp four-barrel was the base engine. Optional engines included the 356hp Tri-Power as seen on our feature car (code WH manual or YJ auto), or the 421HO, rated at 376hp . Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. A larger 4in (101.6mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220hp (164kW) 400 from the 19781979 model year were also included. Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. Thus, the quest to find 100 hp in a 421 started on the flow bench, before a wrench or machine tool touched any part of the 49-year-old engine. Valvesprings: Crower, dual no damper The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . A set of Hooker Super Comp headers will be used on the dyno, and Jim is porting the stock heads to increase intake-port flow by 30 cfm. Once corrected the SD-455 was recertified and was released for production in late April 1973. Bearings: Sealed-Power mains and rods, cam Dura-Bond For 1967, Pontiac retired the 389cuin (6.4L) and replaced it with the 400cuin (6,554cc), a 389 bored-out by +0.06in (1.5mm) to a bore and stroke of 4.12in 3+34in (104.6mm 95.3mm). #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. 1962 - 389 SD Code 544127. Save pontiac 421 complete engine to get e-mail alerts and updates on your eBay Feed. Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. These muscle car profiles include photos and specifications for each model: For related car information, go to these articles: Please copy/paste the following text to properly cite this HowStuffWorks.com article: the Auto Editors of Consumer Guide Head bolts do not pull on the cylinder wall causing distortion. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. Valves: Competition Products stainless steel, 1.92 /1.66-in Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). It's well documented that an internal combustion engine is nothing more than an air pump. For a few more ponies through better oil control, a factory full-length windage tray will be added, since Pontiac didn't use one on this engine originally. By comparison, the factory 421 H.O. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. The Pontiac 2+2 is a full size automobile that was manufactured by Pontiac, built on the B-body chassis.It debuted for the 1964 model year as a trim-only option for the Pontiac Catalina, with special door panels, bucket seats with a center console, and exterior badging.Pontiac marketed the 2+2 as the "big brother" to the popular Pontiac GTO.. Beginning in 1965 the name Catalina was no longer . Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. This was to ensure there was enough fuel to cool the cast offset dished pistons. It requires a compression ratio of at least 10.25:1. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. One of the key upgrades were the 6x4 heads. On this Wikipedia the language links are at the top of the page across from the article title. Beginning in 1967 casting nnumbers moved to the rear of the block just behind cylinder #8 . This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Pontiac V8 Engine Tune Up Specifications. The 301 Turbo was unique since it had a beefier block than the 197779 versions (which carried on in the non-turbo versions in 1980 and 1981), a very mild camshaft with 0.35in (8.9mm) lift and 250 degrees gross duration, a 60psi (4.1bar) oil pump to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft, a fully baffled oil pan, and a specific 800cuft/min (23m3/min) Quadrajet carburetor. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. . Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year.