Tri-power engine rated at 376 hp. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). 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. Engine Oil: 120 ft-lbs. 1965 Pontiac LeMans GTO Mecum. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. . [citation needed]. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. Rod/Stroke ratio: 1.65:1BOTTOM END 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. 1969 - 400 Ram Air III or 350HO Code 48. CO2, . Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM The premier SD 421 cylinder head was the late 1962-early 1963 casting #9771980 aka "980", featuring a larger 11.3cuin (185cc) intake port volume, flowing 230cuft/min (6.5m3/min) @ 28in (710mm). for 1980, and the 8th being a "T" for 1981). Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). 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 . Preparation: File-fit for end gap if needed, wash Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. Secondary: Front and rear #70 The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . 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. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. Bore/Stroke: 4.150/4.00-in Splayed main caps, head bolts tie into main caps. These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! Unique exterior features included "2+2" badges, twin lens taillamps, and chrome bodyside gills; Pontiac's famous eight-lug aluminum wheels were the ultimate optional touch. For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). . In 1961 and 1962 they were available with either one 4 barrel carburetor or a dual 4 barrel carburetor setup depending on whether the buyer wanted to head to the racetrack or drag strip. Thus in March 1973 Pontiac eliminated a timing solenoid that gave full vacuum advance and disabled the EGR valve in high gear after a period of time that happened to exceed the running time of the EPA testing cycle. 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. Pontiac Engine Torque Specs Pontiac Engine Torque Specs. By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Additionally, the 301 W72 never received the option to come equipped with a manual transmission like the standard 301 received in 1979, and disappointingly, production for all Pontiac V8's ended soon after as GM sought to "corporatize" engine production. However, the engine used in these Trans Ams was the same regular production 455 taken from the big body cars Pontiac was producing, and output 200 HP with a torque rating of 330lbft at 2,000 rpm.[13]. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. In 1964 when the new "A" body intermediates came out there was a new corporate (GM) engine size limitation to anything less than 330cuin (5.4L). Cam choice is always extremely important, and Jim decided to go with an aggressive Crower mechanical flat-tappet stick with 247/252-degrees duration at 0.050 and 0.515/0.525 lift (0.495/0.505 with 0.020 lash) with 1.6:1 rockers. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". or Best Offer. It included a new camshaft with duration increased from 288/302 (No. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. For 1965, however, the 2+2 became a bonafide muscle car. Royal Pontiac's engine swap wasn't a new trick for Pontiac. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. Head bolts do not pull on the cylinder wall causing distortion. ENGINE. Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Lobe separation angle: 112-deg 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. The "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. Regarding Crower's upgrade suggestions for its . NASCAR race cars embody the muscle car philosophy of power. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Standard in the Firebird Trans Am, it was still a rare engine. This simply meant that Pontiac installed both the SD-389 and SD-421 into vehicles on its assembly line. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. With the 1964-1967 Pontiac Catalina 2+2, Pontiac achieved a combination of power, road-holding, and fine styling superior to any other big Pontiac, and most of the competition's models besides. 068) to 301/313 (No. He thinks the stock exhaust flow of 180 cfm will suffice for this build. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. From 1969 though 1970, the Ram Air IV was available in both A-Body (GTO, including Judge) and F-body (Firebird, including Trans Am) form. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. 5 January 2007. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? The engine compartment of this concours Catalina is beautifully finished. 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. Both used a single two-barrel carburetor. The 4-barrel version was available from 1978 to 1981 and the Turbo version was limited to the 1980 and 1981 model year, however, it was originally intended to be available for the 3rd generation Firebird before its cancellation by GM. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. By comparison, the factory 421 H.O. 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. 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. It requires a compression ratio of at least 10.25:1. It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). Here are my top six rationales for admiring the 1966 GP. The XS-code 389 was still rated at 360bhp at 5,200 rpm, same as the more common WS-coded Tri-Power 389, but performance was noticeably improved on acceleration runs. In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5L (305.1cuin), Pontiac unveiled the 303 for racing models only, never available to the public. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. A camshaft with 301/313 degrees of advertised duration, 0.407-inch (10.3mm) net valve lift, and 76 degrees of valve overlap was specified for actual production engines in lieu of the significantly more aggressive Ram Air IV-spec camshaft that had originally been planned for the engine (initially rated at 310hp (231kW) with that cam), but ultimately proved incapable of meeting the tightening emissions standards of the era with sufficient margin to satisfy Pontiac emission engineers given expected volume production variations. The Ram Air II also incorporated the first computer-designed camshaft. It was rated at 366bhp (273kW) (gross) in the GTO version. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. Chamber: Closed, special to PMD, 70 cc 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. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. The engines feature a cast-iron block and head and two valves per cylinder. HOT ROD and CAR AND DRIVER) were fitted with the Ram Air IV-spec camshaft and functional hood scoops - a fact that has been confirmed by several Pontiac sources. A common misconception made by enthusiasts was the notion that all Pontiac engine equipped Trans Ams featured the "T/A 6.6" decal on the shaker, however, it was exclusive to the W72 engine that was featured on less than half of all Trans Ams made during this period. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. Kits for Pontiac applications. Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). Engine Oil: 95 ft-lbs. However, in the June 1974 issue of SUPER STOCK AND DRAG ILLUSTRATED, a new 1974 Trans Am with the SD-455 motor ran 14.25 @ 101mph (163km/h). Are you thinking of buying a 2007 muscle car, or any other car? Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. After outselling Oakland, Pontiac became the sole survivor of the two by 1932. Rocker arms: Crower roller, 1.6:1 Primary tube diameter: 1.75-in As Stock drag racing heated up at the dawn of the Sixties, the factories were serving up a constant stream of engines, transmissions and lightweight body par. This test would tend to lend credence to the CAR AND DRIVER and HOT ROD tests of 1973 Super Duty cars with 3.42 gears, no air, and 160lb (73kg) less weight as being representative of production specimens capable of mid to high 13-second passes at 104mph (167km/h). Coil: GM Vacuum advance: Not usedEXHAUST Prices ranged from $2,760 to $3,220 . Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. Duration at .050: 247/252-deg It was removed from the design for the 1960 model year because designers moved the generator and the power steering pump from atop the front of the engine down to the front of the heads to accommodate a lower hoodline. True Pontiac engines were designed and built in Detroitnot on a computer, but often by GI-bill-educated engineers who grew up working with their hands and now had a slide rule in their pocket instead of a greasy rag. Block casting # 9773157. Available only in the 1973 and 1974 Firebird Formula and Trans Am, the SD-455 consisted of a strengthened cylinder block that included 4-bolt main bearings and additional material in various locations for improved strength. - P.B. That's the factory rating of the legendary 421 H.O. The 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. Retainers: Crower steel 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. Boost was wastegate limited to 91psi (0.6210.069bar). Neither casting was equipped with an exhaust crossover. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. Rocker studs: ARP special 34-in bottom 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). However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. Piston-to-deck height: 0.009-in The 389 V8 was first introduced by Pontiac in 1959. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . . The GTO came with a four-barrel 389 V8 with 335 horsepower. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. 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. Diameter: 516-in It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. It produced 120hp (89kW) After 1981, the Pontiac V8 was replaced entirely by the GM "corporate" V8's from Chevrolet and Oldsmobile. The engine build will be discussed in two parts. Collector size: 3.00-inGASKETS It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). The 421 also marked the end of the option for a forged-steel crankshaft. The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. Two tri-power 421s were optional, one with 356 bhp, the other with 376. Pontiac's V8s share the same 6.625in (168.3mm) connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V. Most Pontiac V8s had an overall length (to the edge of the water pump pulley) of 28.25in (718mm), an overall width of 27in (690mm), and a height (not including air cleaner) of 31in (790mm). Valvesprings: Crower, dual no damper High output Pontiac V8 Cylinder Heads. . Manage Settings Pontiac in the 1950s was one of a few US manufacturers that did not regularly identify their engine names and sizes with air-cleaner or valve-cover decals. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. Keepers: Comp Cams race locks If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Pontiac RAIII/IV Engine parts collection Price $14000.00. The SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. Under the leadership of chief engineers Pete Estes and John DeLorean, Pontiac engine guru Malcolm "Mac" McKellar (1920-2011) and crew developed the Super Duty 389 and 421 NASCAR engines that embarrassed the Fords and Chevrolets at Daytona. Piston pins: Icon, SAE 1016 to 1022 Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. Offered on select models from 1957 through 1966, Pontiac's Tri-Power induction system added a new dimension of performance to the General Motors brandand a colorful new term to the hot rodder's vocabulary. 287. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. Fuel pump: Will use 110-gph Carter 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]. It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). The manuals had Hurst shifters. Tri Power engine however was optional. If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is https://www.patreon.com/MyCarStoryWithLouOn "My Car Story" we're in Huntl. The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. street engine. . In addition, a shallower spherical-wedge combustion chamber moved the tuliped valve heads .040" closer to the piston at TDC, improving mixture draw considerably during the intake stroke. 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. It's well documented that an internal combustion engine is nothing more than an air pump. In 1973 a further refined and even stronger but less powerful version, the Super Duty (SD) engine, was planned for Firebird, Grand Am, Le Mans (GTO), and Grand Prix models. For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. in. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. It also sports the four-speed manual, limited . While the 400 offered excellent power in the GTO (360 horses and 445 lb-ft of torque in 1968), Pontiac turned to what it called 'big journal' engines for the muscle machine's next upgrade. 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. Deck Height: 10.215-in The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only.