1966 pontiac 421 engine specs

1966 pontiac 421 engine specs

3.75. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. 1963 - 389 SD Code 543797. 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. 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. Free shipping on many items | Browse your favorite brands | affordable prices. The stroke increased to 4.21-inch (106.9mm). 1966 Pontiac Catalina technical specifications and data. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified engines. Pontiac Engine Torque Specifications. 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. This simply meant that Pontiac installed both the SD-389 and SD-421 into vehicles on its assembly line. Preparation: Install in rod, torque, measure ID Math, not gasoline, makes horsepower under the hood of a Pontiac. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! 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. Pushrods: LPC chrome moly In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 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. 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. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . 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). 1968 - 400 Ram Air II Round Port Code 96. The 2+2 reverted to option status for '67, then died, a proud relic of a time when big cars, Pontiacs in particular, ruled the streets. Initial advance: 18-deg A limited-slip differential and gearing up to 4:11.1 were optional. Compression Ratio: 10.6:1 effective 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. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . 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. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins 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. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. By 1963 Pontiac decided it was time to 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. 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. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! Neither casting was equipped with an exhaust crossover. This included the ESC (Electronic Spark Control) distributor and controller borrowed from the 301 Turbo, which allowed for higher timing without the penalty of engine damaging pinging or preignition. The 338-bhp four-barrel was the base engine. Engine Displacement: 432 ci [citation needed]. It produced 120hp (89kW) After 1981, the Pontiac V8 was replaced entirely by the GM "corporate" V8's from Chevrolet and Oldsmobile. 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]. 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. 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. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM 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. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Lobe separation angle: 112-deg or choose Generic to see kits that might fit a . He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. Though production cars only got the two hood air inlets the name was retained. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. 1. These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. for 1980, and the 8th being a "T" for 1981). Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke (imp.) 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. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. 1966 Pontiac Catalina . In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The 1968 Ram Air II remained at 400 cu. These are general guidelines. Only about 2000 like this one were built with 4 speed Muncie transmissions. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. Once corrected the SD-455 was recertified and was released for production in late April 1973. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The four-barrel 400 was a popular performance option for many of Pontiac's cars. $6.49 shipping. designs, the SD-455 was a much improved engine. 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). Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. Royal Pontiac's engine swap wasn't a new trick for Pontiac. 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 The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. 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. Ever wonder what it would take to increase that number by 100? In 1963 Pontiac dropped the Buick division built 215 cu. Price $15500.00. Brand: Fel-Pro head and intake/ SCE pan and timing cover This was the only Poncho with standard 421-cid power. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. Intake: 218 cfm at 0.500-in It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. Mechanical advance: 36-deg at 3,200 rpm 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. 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 very modest cam, combined with a low-compression ratio of 8.4 (advertised) and 7.9:1 actual resulted in 290hp (216kW) SAE NET. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). 1966: 421: 9782611 (late) 1967-1969. 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. From 1959 to 1966 Pontiac continues making improvements. Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. 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. A panel covers the dash opening where the radio would have been on a standard Catalina. Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. . For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. 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. 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. During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. The 421 was first availabe in a SD (Super Duty) model that was built for racing. 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. It had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). Engine displacement is a function of bore and stroke. The goal of making a Pontiac Hemi succeeded but the engine was never produced. An HO version could be ordered in the GTO, as GM had lifted its restrictions on offering engines larger than 400cuin (6.6L) in mid-sized cars (resulting in the 454 (7.44) Chevrolet Chevelle, The W72 offered many improvements over the standard L78 400 Pontiac. [citation needed]. Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Timing chain: LPC, double rollerINDUCTION Installed position: 110-deg The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. Like the 421, the 428 used a large-journal crankshaft, but externally it was the same size as all Pontiac V-8s of that era (the later 301 used a shorter deck height). Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. The V8 engine was introduced for the 1955 model year as the "Strato Streak". As a result, it was remarkably free of teething problems. The Fresh Air package continued into the 1966 model year. 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. 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. By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Only one is known to survive today. What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. 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. Here are my top six rationales for admiring the 1966 GP. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. 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. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. 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). 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). It was renamed 428 HO for 1968. 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. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. What is important is the total timing, the . . In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Along with proper parts selection, accurate machining and assembly are also important Intake manifold: Original '64 PMD tri-power SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. 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]. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. 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 "455 HO" moniker took on a whole new meaning with the introduction of the 1971 model year; Intended as a low compression progression from the previous years Ram Air IV engine, all 1971 455 HO engines used a heavy duty 4 bolt main block, round port cylinder heads (casting #197; with 8.4: compression), "Ram Air" style exhaust manifolds, and a two-part aluminum intake manifold. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . 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. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. Year: CU IN: Casting # 1967: 326. street engine. 1968 Pontiac GTO 428 / Royal Bobcat. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Information and specs for the Pontiac 421 V8 engine. The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. 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 . Here is another number to ponder: 370 hp. The Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. Ram Air induction was optional in the GTO, though power ratings were unchanged. It also could hold its own against a range of performance cars. Piston pins: Icon, SAE 1016 to 1022 The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). 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 may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. 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). By comparison, the factory 421 H.O. Located at the back of the engine near the Distributor. 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). Preparation: File-fit for end gap if needed, wash 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. 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). The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. ENGINE. Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . "1966 Pontiac 2+2" Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish A higher-output version was offered, called the 326 HO (High Output). The 421 engine is available only with related heavy-duty driveline components. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. 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. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Secondary: Front and rear #70 A total of 1,808 Ram Air IV production cars were built over its 2-year production. 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. Price $30000.00. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. In 1970 the casting number #9799914 Ram Air 400 4-bolt main block also used the 4-bolt main caps on Ram Air applications. For 1965, however, the 2+2 became a bonafide muscle car. Ellingson Motorcars (877) 638-7170. In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). 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. 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. The heads were a new design featuring siamesed intake ports. Officially named the Quadra-Power 400 for 1967 and renamed 400 HO for 1968, the 400 HO was first offered for 1967 as the third engine in the GTO line after the automatic-only 400 2-barrel and the standard 400 4-barrel (the 400 HO would not be offered in the Firebird until the 1968 model year). The SD-455 used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Carb: (3) Rochester two-barrels PMD 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. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. Pontiac V8 Engine Tune-Up and Torque Specifications. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. The last was the 421 HO and included a high-output camshaft and valve train. HP = flow at 28 in/H2O x 0.257 x # of cylinders. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. 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). Preparation: Wash after balance for assembly The GTO came with a four-barrel 389 V8 with 335 horsepower. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Valvesprings: Crower, dual no damper 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. Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). 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. . Factory heavy-duty high-pressure oil pump and eight-quart sump, four-bolt main bearing caps with Moraine aluminum bearings, and #1110976 dual-point distributor without vacuum advance. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). This installment includes the assembly and parts selection up to the long-block. The 428 was increased to 456.12cuin (7,474cc) in 1970. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. All Rights Reserved. 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. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. The first letter equals the month. Pontiac Engine Torque Specs Pontiac Engine Torque Specs. Bore/Stroke: 4.150/4.00-in Oil pump: . 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. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. Torque: See Part 2 Pontiac RAIII/IV Engine parts collection Price $14000.00. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . The 389 was the standard engine on the GTO up to 1966. Lifters: Crower solid with EDM oil hole (0.024 inch) Compression jumped from 11.0:1 to 12.0:1, while other tweaks increased maximum shift points by 500 rpm, to a screaming 6400 rpm.

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