Super Duty 421s were back, tougher than ever. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. Buckets and a console were added to the top-line Catalina interior, which could be optioned with a sport steering wheel and instrumentation that included a tachometer and oil-pressure gauge. Email Email. Standard in the Firebird Trans Am, it was still a rare engine. Vacuum advance: Not usedEXHAUST 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. This was a project started with the end goal of building a 427 Hemi. Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads. 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. 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. Simply called "Ram Air" by Pontiac[17] it was the first in a series of engines available from Pontiac as regular production line options and officially called Ram Air. Only about 400 were produced before the fuel injection system was quietly dropped. High output Pontiac V8 Cylinder Heads. A big chunk of the appeal of the 1965 and '66 2+2 was the fact that you got a standard 421 under the hood: The 338hp, four-barrel 421-cu.in. 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. Initial advance: 18-deg Given that, it was no accident that the leader in intermediate muscle also put together the finest full-size performance machine -- the 1966 Pontiac 2+2. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. From a performance perspective, the 2+2 is pretty impressive. Most likely prompted by its development of the Pontiac OHC six, the GM division built three different experimental SOHC 421 CID V8 engines in the early 1960s. . Maximum flow at 28 inches of water (imp.) PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. 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. The 389 was the standard engine on the GTO up to 1966. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. 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. 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). An example of data being processed may be a unique identifier stored in a cookie. Preparation: Install in rod, torque, measure ID Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. It requires a compression ratio of at least 10.25:1. 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). It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. ENGINE. Though production cars only got the two hood air inlets the name was retained. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. Rocker studs: ARP special 34-in bottom For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. The air cleaners look like those used on the top dog 376 gross HP 421 CI engine but there was also a lesser 356 HP version available too. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. Royal Pontiac's engine swap wasn't a new trick for Pontiac. With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. 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. Tri-power engine rated at 376 hp. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. We and our partners use cookies to Store and/or access information on a device. 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. 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 . Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. Lobe separation angle: 112-deg The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. For 1970 the Trans Am was the only Firebird available with the Ram Air IV, and 88 were produced during the abbreviated 1970 F-body production run. In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 1966 Pontiac Engine Data Location Of Engine Code: (Six-Cyl) - On cylinder head-to-block contact surface behind oil filter pipe. The stroke increased to 4.21-inch (106.9mm). Ram Air induction was optionally available with the 455 HO in the Firebird Formula (standard on Trans Am), and the 2-door LeMans (including GTO). 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. Length: 8.750-inCAM Year. Retainers: Crower steel Head bolts do not pull on the cylinder wall causing distortion. According to GM mandates horsepower was now rated in net figures as opposed to gross, so on paper the 1972 455 HO appeared to have a significant drop in power, but in fact it was very much the same engine, and performance figures reveal this to be true. HP = flow at 28 in/H2O x 0.257 x # of cylinders. One of the key upgrades were the 6x4 heads. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. 093: 66 389 GTO: 65 . Deck Height: 10.215-in . ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . 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. 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 . The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. 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). Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. 744) and a new valve spring package with dampers to positively control valve action. 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. 1966 yk 421 376 a 3x2 1967 zg 230 165 a 1 1967 zm 230 165 a 1 1967 zk 230 165 3 m 1 1967 zs 230 165 3 m 1 . Learn how Classified Ads works . [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. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified engines. A panel covers the dash opening where the radio would have been on a standard Catalina. Transistorized ignition was available. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Pontiac produced the 421 V8 engine from 1961 to 1968. 1968 Pontiac GTO 428 / Royal Bobcat. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . It was rated at 366bhp (273kW) (gross) in the GTO version. It remained on the same platform, but for the 1966 models, it became a different Pontiac series. Ram Air induction was optional in the GTO, though power ratings were unchanged. The Fresh Air package continued into the 1966 model year. From 1977 to 1981 there were 4 distinct 301 versions: For 1981 model year vehicles, the engine codes are the 8th digit of the VIN. 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. 1966 Pontiac Catalina Specifications and Production. The 421 also marked the end of the option for a forged-steel crankshaft. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. 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. 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 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. Once corrected the SD-455 was recertified and was released for production in late April 1973. [19], Parts for Ram Air V engines are not readily available. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. 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. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 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? [4] It was replaced by the 455 for the 1970 model year. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. It was renamed 428 HO for 1968. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. To learn everything you need to know about car engines, see. None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. or choose Generic to see kits that might fit a . By comparison, the factory 421 H.O. The heads were a new design featuring siamesed intake ports. Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. "1966 Pontiac 2+2" That's the factory rating of the legendary 421 H.O. The goal of making a Pontiac Hemi succeeded but the engine was never produced. Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. 1966 Pontiac Catalina technical specifications and data. in. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). 1969 - 400 Ram Air III Code 62. And it cruised silently and rode with less harshness than muscle intermediates. It also sports the four-speed manual, limited . Also bowing in 1967 was the new Firebird, which had the . 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). The 338-bhp four-barrel was the base engine. 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). They came up with a 269-cubic-inch (4.4L) L-head design. The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." [5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. 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. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. The manuals had Hurst shifters. The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. Compression Ratio: 10.6:1 effective The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. Other dimensional factors such as the wheel base, curb weight and length were largely unchanged. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. [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. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. in., again available only in the GTO and Firebird. 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. 63 421 SD: 64: D-Port: 2.02/1.76: 77: 65 GTO, 65 421 HO: 65: D-Port: INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. A higher-output four-barrel carburetor version was offered, called the 326 HO (High Output). [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust 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. Ellingson Motorcars (877) 638-7170. This was a completely stock car on loan from a private owner for the test. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. Rear Main Cap. 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. With some WS6 "Trans Am Special Performance Package" bundles in 1978, the W72 engine was incorporated with the WS6 option group and not listed on the dealer order invoice. 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. Engine Block Date Code. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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 . Year: CU IN: Casting # 1967: 326. 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..



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