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). Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". In the 1968 Pontiac GTO it was given a 10.75:1 compression ratio and tuned to deliver 360 horsepower and 445 foot-pounds of torque.[2]. Rear Main Cap. Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. Shipping to: 98837. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . The Fresh Air package continued into the 1966 model year. Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). Pontiac RAIII/IV Engine parts collection Price $14000.00. 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). 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. Preparation: Disassemble, check ball seat for width, spring tension, plate clearanceHEADS 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. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . Total Timing: 36-deg BTDC The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . Rocker studs: ARP special 34-in bottom Coil: GM Head bolts do not pull on the cylinder wall causing distortion. 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. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins (imp.) The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW). Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. 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. Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). Lift: 0.515/0.525 with 1.6:1 rockers The 428 was increased to 456.12cuin (7,474cc) in 1970. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". Bore/Stroke: 4.150/4.00-in Update your shipping location. This was a completely stock car on loan from a private owner for the test. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. 3.75. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. pontiac engine decoder year code c/i hp tran carb car misc 1962 13b 421 3 m 2 x 4 full super duty 1962 13u 421 4 m 2 x 4 full super duty 1962 bu 421 4 m 2 x 4 full super duty . Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. 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. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. street engine. What is important is the total timing, the . Initial advance: 18-deg The heart of the build, a code 45B 1964 421 HO 370 HP manual trans 4-bolt main block, all Pontiac 421 engines without exception had 4-bolt main caps. Open pressure: 282 pounds at 1.100-in This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. HOT ROD and CAR AND DRIVER) were fitted with the Ram Air IV-spec camshaft and functional hood scoops - a fact that has been confirmed by several Pontiac sources. Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor From a performance perspective, the 2+2 is pretty impressive. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. 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. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got 1.96in (49.8mm) intake and 1.66in (42.2mm) exhaust valves and pressed in rocker arm studs. 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 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. 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 four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . 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. By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. - P.B. Preparation: Install in rod, torque, measure ID 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. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Fuel line size: 38-inch, 516-inch to carburetor A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. The heads were a new design featuring siamesed intake ports. or Best Offer. Pontiac Engine Torque Specifications. 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. Ever wonder what it would take to increase that number by 100? Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. The 389 V8 was first introduced by Pontiac in 1959. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. 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. I don't know if it can be done, but I'm going to try." Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. Engine Specifications. [19], Parts for Ram Air V engines are not readily available. [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). Two tri-power 421s were optional, one with 356 bhp, the other with 376. Valve seals: U.S. Seal 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. Fuel pump: Will use 110-gph Carter
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