1966 pontiac 421 engine specs

1966 pontiac 421 engine specs

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. 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). Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. High output Pontiac V8 Cylinder Heads. [19], Parts for Ram Air V engines are not readily available. Beep, beep! The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. 1966 Engine Codes - Ron's Pontiac Page ENGINE. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. From 1959 to 1966 Pontiac continues making improvements. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. 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. Royal Pontiac's engine swap wasn't a new trick for Pontiac. Pontiac V8 engine - Wikipedia Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. 1965-'66 Pontiac Catalina 2+2 | Hemmings of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. 1966: 421: 9782611 (late) 1967-1969. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. Seat pressure: 110 pounds at 1.600-in Power output ranged from 135hp (101kW) to 170hp (127kW). However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. pontiac 421 complete engine for sale | eBay 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 Pontiac still wanted to offer a performance motor to compete in the performance market, they looked back to the 400 Pontiac and how it could be improved to offer greater performance while meeting CAFE standards. 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. Given how late in the model year it was, Pontiac decided not to incur the costs of recertifying the SD-455 for other models other than the Firebird. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. Block description: '64 421ci #157 There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. Bore/Stroke: 4.150/4.00-in Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. 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. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. Tested: 1968 Pontiac GTO 428 / Royal Bobcat - Car and Driver There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. Maximum flow at 28 inches of water The last was the 421 HO and included a high-output camshaft and valve train. Torque: See Part 2 Manage Settings Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. Free local pickup. Centerline: 110-deg in. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. said the "Pontiac 421 cu. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. 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. 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. NASCAR race cars embody the muscle car philosophy of power. 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). [5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". Pontiac engineers tested their 269cuin (4.4L) V8 in 1949 or 1950 against an OHV Oldsmobile Rocket V8 303cuin (5.0L) downsized to 270cuin (4.4L). Size cfm: Total flow, 1,050 cfm Headers: Hooker Super Comp (for dyno test) Preparation: File-fit for end gap if needed, wash Pontiac 389 Engine Guide - Muscle Car Club It was renamed 428 HO for 1968. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins The camshaft was the HO cam with 288/301 duration. The 301 Turbo package mandated air conditioning, the THM350 (sometimes referred to as the CBC350 in various literature) non-lockup automatic transmission (THM350C lockup in 1981 Trans Ams), and 3.08 rear axle gearing. 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). Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. Pontiac Grand Prix - Muscle Car Club Pontiac Engine Torque Specs - Butler Performance They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. From a performance perspective, the 2+2 is pretty impressive. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. 1966 Pontiac Catalina technical and mechanical specifications The 301 had a bore and stroke of 4in 3in (101.6mm 76.2mm). The rod weighs 751 grams versus the stock rod at 958 grams. What is important is the total timing, the . The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). The stroke increased to 4.21-inch (106.9mm). He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. Preparation: Weigh, soap-and-water wash Super Duty 421s were back, tougher than ever. 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. For 1965, however, the 2+2 became a bonafide muscle car. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. 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. 1965-75 Pontiac & Tempest Tune-up Specifications Only about 2000 like this one were built with 4 speed Muncie transmissions. Valve seals: U.S. Seal Cam was a #541596 McKellar No. 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. Most Pontiac engines were painted light blue. The Block Date Code represents the production date of the engine. 4/21: Not just a date, but a legendary 421-cid Pontiac engine that Tri-power engine rated at 376 hp. Primary tube diameter: 1.75-in The base engine was the 421 four-barrel with 338 horsepower. 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. Muscle Cars You Should Know: 1964-67 Pontiac 2+2 744) and a new valve spring package with dampers to positively control valve action. A History Lesson in Pontiac V8 Power - Engine Builder Magazine Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Although it is much different from the original 1955-vintage Pontiac V-8 powerplant, the 301 has the distinction of being the last true Pontiac V-8 engine, as Pontiac ceased production of these engines effective April 1, 1981. Pre-Owned. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. 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. . Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). 540306 featured 1.92/1.66-inch (49/42mm) valves and was carried over from the previous model year, production stopped in March 1962 and then casting No. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. ][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. 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. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. Along with proper parts selection, accurate machining and assembly are also important 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. Horsepower: See Part 2 Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). 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 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. [citation needed]. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. 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 V8 Engine Codes and Specs - WOW Muscle Cars like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. Pontiac V8 Engine Codes and Specifications. 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. This new material had stronger alloys in the iron. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . 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. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Rod/Stroke ratio: 1.65:1BOTTOM END 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. Preparation: Install in rod, torque, measure ID Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. 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). Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. 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. Total Timing: 36-deg BTDC By comparison, the factory 421 H.O. Oil pan: 8-quart with extended pick-up, fabricated retention clamp 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. 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]. 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. All Rights Reserved. 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. By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. The 421 badging was standard on the 2+2, the 421 H.O. Pontiac offered this to the public as a streetable version of the 421 SD. Kits for Pontiac applications. Learn how Classified Ads works . This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish Deck Height: 10.215-in 1966 Pontiac Catalina 421 H.O. Gives New Meaning to the Term 'Full Floater' Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. He thinks the stock exhaust flow of 180 cfm will suffice for this build. Year: CU IN: Casting # 1967: 326. 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. . 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. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified engines. 1964, 1965, 1966, 1967 Pontiac Catalina 2+2 | HowStuffWorks By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. 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. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Brand: Fel-Pro head and intake/ SCE pan and timing cover 1966 Pontiac 2+2 Convertible 1966 Pontiac 2+2 Convertible 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. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 We and our partners use cookies to Store and/or access information on a device. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. 1966 Pontiac Catalina . There were a few 1962 Grand Prix models that came with a 421 SD from the factory so if someone is lucky enough to have one today then they have a car that is probably worth some decent money simply because of the rarity of these models.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[580,400],'enginefacts_com-medrectangle-3','ezslot_2',115,'0','0'])};__ez_fad_position('div-gpt-ad-enginefacts_com-medrectangle-3-0'); Engine Facts 2023. VEHICLE TYPE . 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. 1966 Pontiac Ventura Specifications. Price $30000.00. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . 1968 - 400 Ram Air II Round Port Code 96. 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 V8 was first introduced by Pontiac in 1959. Rings: LPC (Liberty Performance Components) premium moly, standard tension 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. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. 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. Splayed main caps, head bolts tie into main caps. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. 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 . 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. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It was called the Ram Air IV due to the planned use of four air inlets. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. The engine was available in all full-size Pontiacs. 1966 Pontiac 2+2: A Profile of a Muscle Car | HowStuffWorks 421 CID V8 - 4BBL - Automatic - P.S. 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. Detailed specs review of 1964 Pontiac Catalina Vista 421HO Trophy V-8 With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. Ram Air induction was optional in the GTO, though power ratings were unchanged.

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