SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. 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. 15 GTO facts you might not know about America's original muscle car After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). 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]. ARP - The Official Site | Pontiac Kits 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. Six reasons to revere the 1966 Pontiac Grand Prix | Hemmings PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. 1966 Pontiac 2+2 for sale near Rogers, Minnesota 55374 - Classics on It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. A mere five were built, all with a four-speed transmission. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). The short-deck block and different intake ports also required the design of a new intake manifold. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800cuft/min (23m3/min) Rochester Quadra-jet carburetor with specific jetting. Pontiac produced the 421 V8 engine from 1961 to 1968. 1965-'66 Pontiac Catalina 2+2 | Hemmings 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. - P.Top - Correct Exterior/Interior. 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. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. Pontiac V8 Cylinder Heads - Casting numbers and Specs - WOW Muscle Cars SPECIFICATIONS. The engines feature a cast-iron block and head and two valves per cylinder. Neither casting was equipped with an exhaust crossover. Super Duty 421s were back, tougher than ever. Rod/Stroke ratio: 1.65:1BOTTOM END 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 consent submitted will only be used for data processing originating from this website. 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. Duration at .050: 247/252-deg Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. designs, the SD-455 was a much improved engine. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. All Rights Reserved. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. 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. 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. 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. 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. Pontiac V8 Engine Tune Up Specifications. RamAir 4 Motor Price $15500.00. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. 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. 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. 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. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. pontiac timing ???????? | The H.A.M.B. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified 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. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. 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. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. 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. HP = flow at 28 in/H2O x 0.257 x # of cylinders. While production of 196970 A-body Ram Air IV cars was low at just 1563 units(759 1969 GTOs including 302 Judges, and 804 1970 GTOs including 397 Judges) 1969 and 1970 model year F-body Ram Air IV cars were even rarer at just 245 total units produced. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! 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. 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. Crank: Original '64 421 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. Other dimensional factors such as the wheel base, curb weight and length were largely unchanged. This was underrated at 330hp (246kW). It included a new camshaft with duration increased from 288/302 (No. [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. Balancer: Original PMD rebuilt by Damper Doctor 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). 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 code consists of 3 or 4 digits. The 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). If you've been thinking about cruising the local boulevard in a classy convertible, but find yourself longing for the power under the hood that only a muscle car provides, perhaps it's time to take another long look at Pontiac's restyled 1965 Bonneville convertible. It also could hold its own against a range of performance cars. Continue with Recommended Cookies. It requires a compression ratio of at least 10.25:1. The 2-barrel version was last offered in 1979. For those who may not be familiar with the equation, here it is again: Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. 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 Horsepower: See Part 2 Located at the back of the engine near the Distributor. 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. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. 1968 Pontiac GTO 428 / Royal Bobcat. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. 1965-75 Pontiac & Tempest Tune-up Specifications As a result, it was remarkably free of teething problems. 1967 - 400 Ram Air Code 97. Maximum flow at 28 inches of water Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . In 1967, the Pontiac 2+2 became an option on the . 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. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. To learn everything you need to know about car engines, see. 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 Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. 1966 Pontiac 2+2 421 H.O. Tri Power 376 horsepower 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). The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. Tri Power engine however was optional. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. Prices ranged from $2,760 to $3,220 . The 421 SD produced up . Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model 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. 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. 1963 - 389 SD Code 543797. Head bolts do not pull on the cylinder wall causing distortion. ][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. 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. 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. Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. It added '421' engine badges on the front fenders, 2+2 insignia on the deck lid and rear fenders, and simulated louvers behind the front wheel cutouts. 1966 Pontiac 2+2 $64,995. 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. 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. The engine was available in all full-size Pontiacs. Read. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. 1966 Pontiac Catalina Specifications and Production. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. Wires: NAPA Belden 7 mm This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. In 1967, the cylinder head design was improved for the 400 4-barrel engine. Price $14000.00. The camshaft was the HO cam with 288/301 duration. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. 1966 Pontiac Ventura / Photos, Specs, Design - Auto Museum Online 421 Tri-Power/Hurst 4-Speed: 1966 Pontiac 2+2 | Barn Finds 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). A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14]. Centerline: 110-deg Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Like the 326, it was offered in both 2-barrel and 4-barrel versions. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Kits for Pontiac applications. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. Collector size: 3.00-inGASKETS By comparison, the factory 421 H.O. 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. 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. Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION Block casting # 9773157. Pontiac V8 Engine Tune Up and Torque Specifications - WOW Muscle Cars Oil pan: 8-quart with extended pick-up, fabricated retention clamp All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . 18 watchers That's the factory rating of the legendary 421 H.O. As with all other Pontiac V8 motors that evolved from the 316 V8, the 421 was simply a bored out and stroked version of the popular Pontiac 389 V8. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. Pre-Owned. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. 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. Reductions in reciprocating weight free up horsepower. 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. 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). It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. 1963 Pontiac V8 Engine Specs. Casting No. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. 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. 1962 421 super duty motor Price $30000.00. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. Power output ranged from 135hp (101kW) to 170hp (127kW). McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8 [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. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. . Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. 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. 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. 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. 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). Piston-to-deck height: 0.009-in The four-barrel 400 was a popular performance option for many of Pontiac's cars. 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. Piston pins: Icon, SAE 1016 to 1022 Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. 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. This was the only Poncho with standard 421-cid power. An example of data being processed may be a unique identifier stored in a cookie. Some 400s were dealer installed. It shared the 389's 3+34in (95.3mm) stroke, but its bore was 3.78in (96.0mm) for a displacement of 336.66cuin (5.5L). The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. 1967 was the last year for closed-chambered heads. 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. [19], Parts for Ram Air V engines are not readily available. Casting number: 97770716, '64 date Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. Pontiac V8 Cylinder Heads - Wallace Racing Sponsored Stories . The goal of making a Pontiac Hemi succeeded but the engine was never produced. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. 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). 287. 1966: 421: 9782611 (late) 1967-1969. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. (V8) - Stamped on right front side of block or beneath production . The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). The 421 engine is available only with related heavy-duty driveline components. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs 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. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . Year: CU IN: Casting # 1967: 326. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Length: 8.750-inCAM It was rated 180hp (134kW) @ 4600rpm and 264lbft (358Nm) @ 2400rpm with a two-barrel carburetor, 200hp (149kW) @ 4600rpm and 278lbft (377Nm) @ 2800rpm with the four-barrel carburetor. 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. 1969 - 400 Ram Air III Code 62. Still, it was the strongest American engine offered that year. 4/21: Not just a date, but a legendary 421-cid Pontiac engine that The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. $6.49 shipping. Pontiac V8 Engine Tune-Up and Torque Specifications. Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years. 1965 Pontiac Bonneville Convertible | Hemmings Example: A128 = January 12, 19*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. The 428 was increased to 456.12cuin (7,474cc) in 1970. From a performance perspective, the 2+2 is pretty impressive. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . The 301 had a bore and stroke of 4in 3in (101.6mm 76.2mm). Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. . In 1963 Pontiac dropped the Buick division built 215 cu. 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. Valve guides: K-Line, liners . Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 716-inch-diameter (11mm) bolts. 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. 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. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. It also sports the four-speed manual, limited . Keepers: Comp Cams race locks The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Styling for Status. Whether all were installed in GTOs is unknown. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Coil: GM [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements.