Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Only about 400 were produced before the fuel injection system was quietly dropped. Read. Sponsored Stories . Primary tube diameter: 1.75-in [citation needed] It was the first engine that incorporated Pontiac's round-port head design in a production vehicle, however the intake port was the same as other D-port heads, leaving a head which exhaust port could nearly match the intake at high valve lifts. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! Vacuum advance: Not usedEXHAUST Year: CU IN: Casting # 1967: 326. Rated at 370 horsepower at 5,200 rpm and 460 pounds-feet of torque at 3,800 rpm, it has 10.75:1 compression, with induction through three Rochester two-barrel carbs, Pontiac's well-known "Tri-Power" setup. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). 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. Once corrected the SD-455 was recertified and was released for production in late April 1973. . 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. 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. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. It was the same engine as the '67-'68 400 HO[18] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob located under the dash, below and to the right of the steering wheel, its bracket labeled "RAM AIR". We and our partners use cookies to Store and/or access information on a device. NASCAR race cars embody the muscle car philosophy of power. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Engine Oil: 95 ft-lbs. Where else will the extra 100 horses come from? Manage Settings Math, not gasoline, makes horsepower under the hood of a Pontiac. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. Laconic would be one way to describe this Pontiac's eBay listing, all it states is, "1966 Pontiac Ventura, 421 Tri-Power, 4 speed Runs/ Drives Great, Very Clean - Garage Kept".OK then, now you know what I know. The 1979 W72/WS6 equipped Trans Am was considered to be one of the overall best performing cars of the decade due to having a powerplant that produced more power than any other competitor on the market at the time with handling equipment to supplement the performance.[12]. Information and specs for the Pontiac 421 V8 engine. This is the original car featured in the May 1962 issue of Motor Trend Magazine that was modified by Royal Pontiac and driven by Jim Wangers. Carb: (3) Rochester two-barrels PMD The mighty Pontiac 421 was a star on the drag strip and a super nova on the Nascar tracks of the first half of the 60s. 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. It was rated at 475hp (354kW). The stroke increased to 4.21-inch (106.9mm). Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins Pontiac V8 Engine Tune Up Specifications. Compression Ratio: 10.6:1 effective 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). Are you thinking of buying a 2007 muscle car, or any other car? For 1971, Pontiac introduced another High Output (HO) version with standard internal parts, a reinforced block with four-bolt main bearing caps, and improved cylinder head design with 18-inch taller (3.2mm) intake ports and special round exhaust ports for better breathing, yet still making just 335hp (250kW) gross (or 310hp (231kW) in the more accurate SAE Net system). It requires a compression ratio of at least 10.25:1. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. Federal emissions standards and the drive towards "corporate" engines shared among all GM divisions led to the progressive demise of the Pontiac V8 through the late 1970s. Free shipping on many items | Browse your favorite brands | affordable prices. Head bolts do not pull on the cylinder wall causing distortion. 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. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. It's well documented that an internal combustion engine is nothing more than an air pump. 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. 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. . Pontiac . 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. 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 . Pushrods: LPC chrome moly Calling into play enormous power and a decent 55/45 weight distribution, the 2+2 could be launched with little tire spin and guided through corners with alarming efficiency. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. Intake: 218 cfm at 0.500-in These are general guidelines. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. $6.49 shipping. . ", https://tran-zam.com/fhistory/1977Engines.aspx, "Hitman's Pontiac Trans Am Site - WS6 and WS7", https://tran-zam.com/fhistory/1978Engines.aspx, https://tran-zam.com/fhistory/1975Engines.aspx, "Unsung Muscle: '75 455 HO Pontiac Trans Am", https://tran-zam.com/fhistory/1981Engines.aspx, "Directory Index: Pontiac/1967 Pontiac/1967_Pontiac_Performance_Brochure", "609ci Pontiac Ram Air V - Chief Stomp 'Em", Pontiac experimental V8 427 Hemi TOHC Tamrazs Parts (800) 442-4601, "McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8", https://en.wikipedia.org/w/index.php?title=Pontiac_V8_engine&oldid=1136467635, Articles needing additional references from January 2010, All articles needing additional references, Articles that may contain original research from October 2016, All articles that may contain original research, Articles needing cleanup from September 2022, Articles with bare URLs for citations from September 2022, All articles with bare URLs for citations, Articles covered by WikiProject Wikify from September 2022, All articles covered by WikiProject Wikify, Articles with multiple maintenance issues, Articles with unsourced statements from December 2008, Articles with unsourced statements from April 2021, Articles with unsourced statements from February 2018, Wikipedia articles needing clarification from April 2021, Articles with unsourced statements from July 2016, Articles that may contain original research from September 2018, Articles with unsourced statements from March 2018, Articles to be expanded from February 2020, Articles with empty sections from February 2020, Creative Commons Attribution-ShareAlike License 3.0, 7.9:1, 8.0:1, 8.4:1, 8.5:1, 8.6:1, 8.9:1, 10.0:1, 10.25:1, 10.5:1, 10.75:1, 11.0:1, Two-barrel carburetor, 7.9:1 compression, 192hp (143kW) @ 4400rpm, 297lbft (403Nm) @ 2800rpm, Four-barrel carburetor, 8.9:1 compression, 216hp (161kW) @ 4800rpm, 315lbft (427Nm) @ 2800rpm, Two-barrel carburetor, 8.9:1 compression, 205hp (153kW) @ 4600rpm, 294lbft (399Nm) @ 2600rpm, Four-barrel carburetor, 8.9:1 compression, 227hp (169kW) @ 4800rpm, 312lbft (423Nm) @ 3000rpm. The 303 had shorter connecting rods, smaller 2.5in (64mm) journals and a solid lifter version of the Ram Air IV camshaft. 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 Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports. 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. SELLER Glendale, Arizona 85305. Size cfm: Total flow, 1,050 cfm The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. Located at the back of the engine near the Distributor. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. Ever wonder what it would take to increase that number by 100? of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. Casting No. The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. . Even more powerful were the 421 Super Duty V8s that could produce up to 410 horsepower. An evolution of the RA IV and H.O. The last was the 421 HO and included a high-output camshaft and valve train. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Total Timing: 36-deg BTDC 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). SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Beginning in 1967 casting nnumbers moved to the rear of the block just behind cylinder #8 . The GTO came with a four-barrel 389 V8 with 335 horsepower. See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. 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. Along with proper parts selection, accurate machining and assembly are also important. 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. At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . Standard in the Firebird Trans Am, it was still a rare engine. 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. 3.75. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. in. 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 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. The code consists of 3 or 4 digits. Prices ranged from $2,760 to $3,220 . . In 1967, the Pontiac 2+2 became an option on the . Initially marketed as a 287cuin (4.7L), it went on to be manufactured in displacements between 265cuin (4.3L) and 455cuin (7.5L) in carburated, fuel injected, and turbocharged versions. Horsepower: See Part 2 It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. Rocker studs: ARP special 34-in bottom Price $14000.00. 1966 Pontiac Catalina . The 389 was the standard engine on the GTO up to 1966. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. However, the RA II was limited to a 1.50:1 rocker ratio, while the RA IV used a 1.65:1 ratio, which yielded significantly greater total lift and, therefore, superior flow and power. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. 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. ][citation needed] T, While the exact total number of Ram Air V engines produced is not positively known, only about 25 303cuin (5.0L) engines were produced and about a dozen 428s and 366s. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. The Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. 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]. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. 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. Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. VEHICLE TYPE . The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52in (13mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). 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. 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. 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. release the 421 V8 officially to the general public and the motor would continue to be available until the end of the 1966 model year. 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. Rings: LPC (Liberty Performance Components) premium moly, standard tension The 421 engine is available only with related heavy-duty driveline components. 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). Lifters: Crower solid with EDM oil hole (0.024 inch) A new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. Deck Height: 10.215-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. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). or choose Generic to see kits that might fit a . That's the factory rating of the legendary 421 H.O. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). Unusual for a major automaker, Pontiac did not have the customary "small-block" and "big-block" engine families common to other GM divisions, Ford, and Chrysler. Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW). Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Pontiac RAIII/IV Engine parts collection Price $14000.00. Engine Oil: 120 ft-lbs. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4+332in 4in (104.0mm 101.6mm) and came with dual four-barrel carburetors. or Best Offer. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. 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 . Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. A three-speed stick was standard; a four-speed and automatic cost extra. Ellingson Motorcars (877) 638-7170. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . 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. 1967 was the last year for closed-chambered heads. [4] It was replaced by the 455 for the 1970 model year. 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). 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). Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. The 1981 rendition of this engine was officially called the 301-EC [EC standing for Electronic Controls] in the 1981 GM factory service manual, removing the need for a W72 option separately as it was now the standard motor, similar to how all W72 engines in 1979 were coded L78.[16]. Bore/Stroke: 4.150/4.00-in Tri-power engine rated at 376 hp. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. 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. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. The four-barrel version, set up for sustained high speeds, had 390 hp. Though production cars only got the two hood air inlets the name was retained. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. The 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. 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. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust 1966 Pontiac Engine Data Location Of Engine Code: (Six-Cyl) - On cylinder head-to-block contact surface behind oil filter pipe. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. 1968 - 400 Ram Air II Round Port Code 96. Chamber: Closed, special to PMD, 70 cc Cam was a #541596 McKellar No. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. 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. engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . 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. Engine Specifications. Bolts or Parts: Lube or Sealer: Torque to: Main Caps. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. 068) to 301/313 (No. for 1980, and the 8th being a "T" for 1981). Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". 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).
1966 pontiac 421 engine specs
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