He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. Size cfm: Total flow, 1,050 cfm Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 Neither casting was equipped with an exhaust crossover. 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. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor . All 1977-1978 Trans Ams ordered with the 4-speed Borg Warner Super T-10 manual transmission received the W72 T/A 6.6 engine. 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. That's the factory rating of the legendary 421 H.O. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). A higher-output version was offered, called the 326 HO (High Output). Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Once corrected the SD-455 was recertified and was released for production in late April 1973. It also could hold its own against a range of performance cars. Like the 326, it was offered in both 2-barrel and 4-barrel versions. 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). 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. (imp.) Oil pump: . Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. Timing chain: LPC, double rollerINDUCTION aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. In 1977 the 400-cubic-inch (6.6L) T/A 6.6, (RPO code W72) was created to fulfil the performance engine gap in the Pontiac line-up. Deck Height: 10.215-in The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. 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). Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. Pontiac . All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". . Preparation: Wash after balance for assembly Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning). Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . Preparation: Cook, bead blast, magnaflux, bore, true decks, align bore The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. In 1963 Pontiac dropped the Buick division built 215 cu. On premium fuel, it was rated at 207 hp at 5200 rpm and . 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. It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. 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? 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. Piston-to-deck height: 0.009-in Math, not gasoline, makes horsepower under the hood of a Pontiac. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. One version of the engine featured camshafts driven off the front of the engine, another design had the cams driven by gears off the back of the engine. The compression ratio will be 10.6:1. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. ENGINE. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. 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 new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. Learn how Classified Ads works . Bore/Stroke ratio: 1.04:1 It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. Year. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. 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. 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 first letter equals the month. A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". 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 . 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. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . Only one is known to survive today. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. The fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. The camshaft was the HO cam with 288/301 duration. Head bolts do not pull on the cylinder wall causing distortion. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". 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. Primary tube diameter: 1.75-in 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. According to the June 2019 issue of Muscle car Review magazine, during dyno testing performed during that era, the National Hot Rod Association (NHRA) rated this Pontiac W72 400 T/A 6.6 engine at 260 to 280 net horsepower instead of the 220-hp rating published by Pontiac. 1962 - 389 SD Code 544127. - P.B. 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. Valve guides: K-Line, liners 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. Styling for Status. It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. The main innovation of the Pontiac engine was reverse-flow cooling and the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. 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. Beep, beep! While not related to the 400 W72, the concept was the same. Tri Power engine however was optional. 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. The Ram Air IV also used a lightweight aluminum intake-manifold that produced a weight savings of 1015lb (4.56.8kg). Oil pan: 8-quart with extended pick-up, fabricated retention clamp Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. This was based on results of over 1 million test miles, which was unheard of at the time. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. 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. Pushrods: LPC chrome moly 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). 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. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. 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. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. When Robert Critchfield took over as general manager in 1952, he launched an ambitious plan to move Pontiac into the upscale, mid-range market occupied by Oldsmobile, and that demanded V8 power. 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. Even more powerful were the 421 Super Duty V8s that could produce up to 410 horsepower. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Though a change of camshaft would delay production, Pontiac decided to change camshaft, employing one with identical timing to the 744 camshaft, which had been used in the 400 Ram Air(aka Ram Air III) engine with manual transmissions. The main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. Intake: 218 cfm at 0.500-in Also bowing in 1967 was the new Firebird, which had the . It was called the Ram Air IV due to the planned use of four air inlets. Engine Oil: 120 ft-lbs. 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. Pontiac Engine Torque Specifications. VEHICLE TYPE . One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. Price $14000.00. 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). 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. 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 . 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. By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW).