Bore was up to 4.0in (100mm) and stroke was increased to 3.6875in (93.66mm) for 371cuin (6.1L). In 1974 you checked off the GTO option on the X body Ventura 2 and you got a Pontiac 350 (really a 355 ). With a 4-barrel carburetor and 10.75:1 compression, the Olds 215 made 195hp (145kW) at 4800rpm and 235lbft (319Nm) at 3200rpm with an automatic. ------------------------------------------------------------------------. Horsepower Range: 215 @ 3,600 rpm - 368 hp @ 5,200 rpm. So the best Pontiac could do was to offer the GTO with the base engine as the 326. This engine was only available in the Oldsmobile Starfire and a performance economy model called the Jetstar I. . [12] The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the shafts and rockers were unique to Oldsmobile. two combinations were not listed. Two-barrel carburetion was standard; all high performance 324s came with four-barrel carburetors. The 455 would produce between 275 and 400 hp in different configurations. An interesting tool is the link on the right side of the page to show all the cars that use the engine you have selected. With a 4-barrel carburetor and 10.25:1 compression, the Olds 215 made 185hp (138kW) at 4800rpm and 230lbft (310Nm) at 3200rpm with a manual transmission. Some Olds 403 engines may have come with solid main webs. PONTIAC ENGINE CHART ENGINE BORE STROKE MAIN DIA. Full specs. Powered by Invision Community, Before the 330 cubic inch limit was established the, Hi, ive never heard of the Chevy reaction in 38 years of studying, history. With an 8.75:1 compression ratio and a 2-barrel carburetor, the Olds 215 had the same ratedhp, 155hp (116kW) at 4800rpm, as the Buick 215, with 220ftlbf (300Nm) of torque at 2400rpm. IN. Excessive engine temperature becomes a bigger issue as the motor ages and rust fills coolant passages. It was the first mass-produced OHV V8, in 1949. The main distinguishing features of this engine were a slightly different camshaft profile from the standard ultra high compression engine and factory dual exhaust. The LeMans uses one of the best Pontiac street cams, the 068 with a 800cfm Q-Jet and I shift at a safe 5,200. Most of these engines were very similar, using the same bore centers and a 9.33in (237mm) deck height, raised on "big-block" versions to 10.625in (269.9mm). [5], This engine was used in GMC heavy trucks as the "370" of 232 gross HP at 4200 RPM and torque 355 gross lbs-ft at 2600 RPM from 1957 to 1959. Issued: 5/20/1977 The 360 and 361 shared the exact same 4+18 inches (100mm) bore and 4+12 inches (110mm) stroke, but the 361 used the larger "Group 3" block. An Ultra High Compression Toronado Rocket version of the 425cuin (7.0L) V8 was made for the 1966 Toronado. Would you be willing to share some of your knowledge with me? The 278-cubic-inch (4.6L) 278 was released in 1939 alongside the 308, sharing the same 4+12 inches (110mm) stroke but with a 3+58 inches (92mm) bore. The Pontiac 350 (starting in 1968) dimensions are 3.88 bore and 3.75 stroke giving 354.71 or 355 cubic inches. By Joshua Weinstein | Updated June 8, 2022 Oldsmobile released the small-block 403 in 1976 for the 1977 model year. How many times did the factory call a 350 Pontiac engine a 350 when it was a 355 all along. From 1952 to 1959, GMC manufactured the civilian 302 engine, which was not sealed, had a mechanical fuel pump, and used a standard oil pan. The 326 was used as the base model for the Pontiac Tempest. ), Welcome to the JEGS High Performance Tech Articles Page. Though if the block is rusty, it may need to be torn apart and cleaned. Thanks to the emissions components, the stock 403 had a low compression ratio, bad cylinder heads, and poor fuel economy. ---------------------------------------------------------------------------. It shares the same 5 inches (130mm) stroke as the 426 and 477, with a 4+38 inches (110mm) bore. General Motors Atlas engine#LL8 (Vortec 4200), https://en.wikipedia.org/w/index.php?title=GMC_straight-6_engine&oldid=1152563382, This page was last edited on 1 May 2023, at 00:27. Power for the base engine was up to 315hp (235kW), even though compression was down a quarter point, to 9.75:1.[9]. The 403 Oldsmobile was generally painted "Corporate GM Blue" on every model line it was equipped in. in. Each engine in this generation is quite similar with the same size block and heads. The Olds 403 was designed to be a big block in a small-block package. It was used in most Oldsmobile models, as well as those from Buick, Cadillac, Chevrolet, and Pontiac. Using the 5 liter Rover block and crankshaft, a maximum displacement of 317.8cuin (5,208cc) is theoretically possible.[14]. These carburetors did not open progressively; they were either open or closed. JavaScript is disabled. Blow-by like that could be piston rings from what I understand. Output for 1983-1985 was 180hp (130kW) and 245lbft (332Nm). Power is delivered to the wheels through a 3 speed manual gearbox. This is a raised-deck engine. General Motors designed the 403 to replace the big-block Olds 455, which GM decided had outlived its usefulness. Advertised Comp Ratio:8.35:1 It produced a maximum 136 hp @ 3000 rpm and 273 lbft @ 1000 rpm. The small bore of the Pontiac 350, which limits the breathing capability of the heads, really makes building one of these a waste of time. The piston-to-deck height on all Pontiac engines was always 0.023". The stroke in the 326 was not changed at all and the compression was kept much higher than many of the lower end 2 barrel 389 motors. Pontiac management urged that the design allow for future displacement increases, which eventually permitted the basic combination to displace 455-ci in a matter of years. If I were to build a 350, it sure would not be a Pontiac. 236 [22] This was the first engine to use the smaller Rochester Dualjet two-barrel carburetor, the only carburetor used on the 260. While the '68 350 H.O. Initially the paint was red, except for metallic blue in the Toronado applications; 1970-1976 versions were metallic blue at first, then nonmetallic blue. JavaScript is disabled. The EGR valve is a common failure point, though inexpensive to replace. That was going to be the extent of the divisions uses for this engine. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. GMC replaced the Pontiac 223 with their own 228-cubic-inch (3.7 L) 228 in 1939. The GMC 630, 660, 720, and 750 Series of the 1950s offered the 503. The L34 used a 4-barrel carburettor and produced 160170hp (120130kW) and 275ftlbf (373Nm). Power listed as 91 Net HP @ 3000 rpm; torque 201 Net lb ft @ 1000 rpm. But due to its big bore and short stroke, the 403 can be a formidable power plant. (October 2016) 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. 1977 ? The first second-generation Oldmobile V8 330cuin (5.4L) "Jetfire Rocket" introduced in 1964 and produced through 1967. Additionally, emissions regulations forced GM to choke the big-bore Oldsmobile V8 with restrictive heads. It's beneficial when running a . Power ratings for 1955 were 190 HP @ 3200 rpm; torque 350 lb ft @ 1000 rpm. If so, I will start with some basic questions. All of these three engine use a 3.25 main bearing, and cranks interchange between the three sizes. 326 2bbl or 4bbl was a option just like GTO was a option. It was the only GM engine to meet US emission standards using a carburetor all the way up to 1990. The firing order is the secret behind the heartbeat of every engine. Even that engine is a larger version of the 287cid Pontiac V8 that arrived in 1955. The company later introduced a new vehicle, the Oldsmobile Aurora, with a new generation V8. Going any bigger will require a larger aftermarket block. My 59 Catalina, 389 Tri-Power 4speed hydro with 3.90's or 4.10's ran a consistent 13.90 @ 101-102mph. For example, with a bore of 4.00, a stroke of 3.48, and 8 cylinders, begin substituting the letters for the numbers in the formula: (3.14159/4) x (4 squared or 4x4) x 3.48 x 8. These changes increased torque to 250lbft (340Nm) but lowered power to 170hp (130kW), while lowering the RPM at which peak power and torque was achieved. Post in the forum instead. Many customers did not keep the reservoir filled, or had mechanical problems with the turbocharger system which resulted in many of the turbo-charger installations being removed and a conventional 4 barrel carburetor and manifold installed in its place. The 324 was shared with GMC trucks. It was generally paired with the Turbo Hydramatic 350 3-speed automatic or the Turbo Hydramatic 400 3-speed automatic in rear wheel drive vehicles, in the case of front-wheel drive vehicles, the Turbo Hydramatic 425 FWD 3-speed automatic. We're reader-supported, and may earn commissions when you buy through our links. 394s were produced from 19591964 and were available on many Olds models. It weighs a claimed 1488 kg at the kerb. The L46 V8 is known primarily for its use in the Corvette, where it was presented as one of several engine options during 1969 and 1970. Back when I had my 326 in a 65 LeMans I might say that it smoked the tires like nothing and would run with about anything on the road if you had enough guts to ride with me (30 years ago). It was no longer available in cars in 1961. I ran a 455 with #62 heads on my 1965 Bonneville. ive been wondering, what are the basic differences between pocho 350s and 400s and SBC 400s. if you only have stock parts to work with a Poncho motor will run in the 12's pretty easy. 1964 Tempest GTO, Yes you'll find 'em with a 326. pattern. All Oldsmobile V8s use a 90 bank angle, and most share a common stroke dimension: 3.4375in (87.31mm) for early Rockets, 3.6875in (93.66mm) for later Generation 1 engines, and 3.385in (86.0mm) for Generation 2 starting in 1964. "Kelly", Jr. Baechtel, John. It has been purported that there is a 403 Oldsmobile block and cast that has solid main webs that may have been equipped in vehicles such as the Pontiac Firebird equipped with a towing package, but there are currently no clearly documented surviving examples. A 4oo block with a 3" stroke displaces 321 cu. Pontiac's are very unique as the block deminsions are all the same from the 326 clear up to the 455 thus making it easy to perform sleeper type swaps. In the mid-1980s, hot rodders discovered the 215 could be stretched to as much as 305cuin (5L), using the Buick 300 crankshaft, new cylinder sleeves, and an assortment of non-GM parts. These characteristics make the Olds 403 an excellent choice (on paper) for high performance builds, as it has the perfect combination of bore and stroke. Rating: 4.23 (162 Votes) two combinations were not listed. Before replacing emissions components on an Olds 403, replace all vacuum lines first. Ferrari 250 GTO: Unleashing the Power of Elegance. The last GMC-only straight six was the 270-cubic-inch (4.4L) 270. Additionally, the 403 had windowed main webs, which reduced the internal strength of the block in the crankcase area. It terminalled the quarter at about 6000 in second - way too much for the stock rods but it really came alive at 5000. It shares the same 5 inches (130mm) stroke as the 426 and 451, with a 4+12 inches (110mm) bore. As is the case with all pre-1972 American passenger car engines, published horsepower and torque figures for those years were SAE "Gross," as opposed to 1972 and later SAE Net ratings (which are indicative of what actual production engines produce in their "as installed" state - with all engine accessories, full air cleaner assembly, and complete production exhaust system in place). For same or less money you could have a decent 455 Pontiac which is physically the same external size and weight (within a couple pounds). Pontiac marketed the 336 as a 326, and after some time, someone in GM figured out the actual bore and stroke made 336 cid. Oldsmobile used the popular LV2, a 307-cubic-inch (5.0L) engine, commonly known by the VIN code "Y", from 1980-1990. designed the 403 to replace the big-block Olds 455. You need to factor in your driving patterns before opting for pay-as-you-go auto insurance. This 428CI Pontiac Engine from out 2013 Engine Masters Competition offers 738HP, but is still pump-gas friendly! The 455 big block Olds V8 was replaced in 1977 with the 403cuin (6.6L) small block, which used a 4.351in (110.5mm) bore, the largest ever used in a small-block V8, with the Olds small-block standard deck and 3.385in (86.0mm) stroke. My first "NEW" car, ordered in Nov of 68, delivered in Dec 68. It uses the same 6.625-inch center-to-center Pontiac rods as the big motors, yielding a great 1.77:1 rod/stroke ratio, even with its relatively long 3.75-inch stroke. Join our Discord to interact with us and chat about cars and specs. used small-valve No. The famous 19771978 GMC Motorhome also came equipped with an Oldsmobile 403. AV Secondary. A 2-bbl engine rated at 250 HP was installed in a 1971 Pontiac 350, with an engine power rating of 8.8:1 CR. It was produced from 1941 through 1963, and was an OHV/pushrod engine. [21] It produced 110hp (82kW) net and 205lbft (278Nm). All the crankshafts on the above engines use 3" main bearings and have the same stroke for interchangeability. The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400cuin (6.6L) and the 455cuin (7.5L) big blocks used a stroke of 4.25in (108mm), with crankshaft material changed to cast iron except in a few rare cases. The 1955 model upped the compression to 8.5:1 for 185hp (138kW) and 320lbft (430Nm) in the 88 and 202hp (151kW) and 332lbft (450Nm) in the Super 88 and 98. The Rocket, along with the 1949 Cadillac V8, were the first post-war OHV crossflow cylinder head V8 engines produced by General Motors. 4-barrel models used 9.25:1 compression in 1957 and 10:1 in 1958 for 277hp (207kW) and 400lbft (540Nm) and 305hp (227kW) and 410lbft (560Nm) respectively. In 1963 Pontiac continued with its tradition of making new engines out of old engines and decided to reduce the bore of the popular 389 motor in order to make the 326. Pontiac settled on a 3.75-inch bore and 3.25-inch stroke to produce a 287-ci package. A lightweight valve train. Stroke is 3.8125. For example, a 350 cubic inch engine to liters is 350/61 = 5.737, rounded down to 5.7 liters. The 400 shared the same 3.75-inch stroke of the 389, but increased the bore from 4.0625 to 4.120 inches. and the 326 grew to 350 cubic inches, ensuring that Pontiac would remain competitive against the 350s from Chevrolet, Buick and Oldsmobile, and Chrysler's 340, thus ending the . . The "Rocket" name disappeared from the air cleaner decal in 1975, the same year that the catalytic converter was added to the emissions control system. Dad always said, "Son, WISH in one hand and..". Paul Mon, Mar 27th, 2023 Post Comment "> Its reliable when maintained, and has a surprising amount of torque for a stock smog small block. Mr. Pontiac V8 Engine Bore Sizes. The Pontiac 350 (starting in 1968) dimensions are 3.88 bore and 3.75 stroke giving 354.71 or 355 cubic inches. The Buick version was rated at 200hp with an 11:1 compression ratio. "Affordable Aluminum V8's [sic]", in, Turbo Hydramatic 425 FWD 3-speed automatic, "1975-79 Cadillac Electronic Fuel Injection", "Oldsmobile 403 Engine - Car Craft Magazine", https://en.wikipedia.org/w/index.php?title=Oldsmobile_V8_engine&oldid=1150945476, 1968 and 1969 400s shared the Olds big-block standard 4.25in (108mm) stroke with the 455 but used a, 19681970 Oldsmobile Toronado GT (W34), 400hp (300kW), This page was last edited on 20 April 2023, at 23:44. See the holes? Replacement for GM large venturi Quadrajet. It was the largest in the GMC straight-6 line until the 477 debuted late in the 1940 model year. I am surprised the LeMans is that heavy. Tempest bodies were use for Old and Buick the first few years. Thats enough to make it a piece of historical automotive hardware. The 502.7-cubic-inch (8.2L); 4+916 by 5+18 inches (115.9mm 130.2mm) GMC inline six was more numerous than the 426 inline six, starting in 1950 and ending with the 1959 model year. The Fora platform includes forum software by XenForo. Bore was up to 4.125in (104.8mm) for the largest first-generation Rocket, the 394cuin (6.5L). [19] The 403 was never featured with a manual transmission and the crank was never manufactured for a pilot bearing. 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 . Known variously as the Rockette, Cutlass, and Turbo-Rocket by Oldsmobile (and as Fireball and Skylark by Buick),[10] it was a compact, lightweight engine measuring 28in (71cm) long, 26in (66cm) wide, and 27in (69cm) high (same as the small-block Chevy),[11] with a dry weight of only 320lb (150kg). Categories. ft/52.5 kgm) at 3200 rpm respectively. Enjoy banner ad-free browsing with Hot Rod Forum Plus. Engine Blueprint Specifications: 1969 Pontiac 350 HP 400 V8 Tempest. Evrything is different (block, heads, etc) but I think that the tranny's will still bolt up, but don't hold me to that. Would you like to see a list of all the cars where this engine is used? If your Olds 403 overheats, check the usual suspects (radiator cap, coolant level, thermostat), run a pressure test, and flush the cooling system. The 303-cubic-inch (5.0L) engine had hydraulic lifters, an oversquare bore:stroke ratio, a counterweighted forged crankshaft, aluminum pistons, floating wristpins, and a dual-plane intake manifold. Only the center carburetor was mechanically connected to the throttle pedal, and it was the only one equipped with a choke. Bore Diameter (in inches): Crankshaft Stroke (in inches): Number of Cylinders: CID: Calculate: Calculate Converting CID to Liters and Liters to CID To convert cubic inches to liters, divide the cubic inches by 61. Engine Blueprint Specifications: 1977 Pontiac 170 HP 350 V8 . [citation needed] The 1977-1980 350s have lighter castings, including a thinner block with large "windows" in the main bearing bulkheads,[citation needed] and have crack-prone cylinder head castings[citation needed] manufactured by Pontiac Motor Division (castings are marked "PMD"; these heads were also used on the 260),[citation needed] and a lightened crankshaft. Olds engineers kept the retired 425-cid engine's 4.126 bore. By late 1956, many Olds dealers learned about the problem. For a better experience, please enable JavaScript in your browser before proceeding. Trans mount is the same. Yes the Idea of the GTO came from DeLorean and also from two Pontiac staff engineers, Bill collins and Russ Gee, and happened at the GM proving grounds in DeLorean's Saturday what if sessions. All four low-deck engines have a stroke of 3.8125 inches (96.84 mm) and used 7 inch long connecting rods. From the 1950s through the late 1970s, each GM division had its own V8 engine family. are the heads considerably different? From Wide-Track to Tigers, Great Ones, to Pontiac Breakaway excitement, Jim was the man who let everyone SEE what Pontiac was doing. The Classic Oldsmobile Forum is an excellent spot for questions and troubleshooting. It shared the same compression ratio of the Toronado Rocket at 10.5:1. The 248 was discontinued in 1955. So, you have to be sure of what you're looking at. is that the one they call the 350 Rocket? Two distinct versions of the 400 CID engine were made: The 1966-1967 4-4-2 400cuin (6.6L) V8 was a short stroke engine which featured B and C cast large-valve cylinder heads and hydraulic lifters of larger diameter, as well as push-rods of different length and diameter than the standard Olds Rocket V8. With some major improvements it'll live behind a 12 second 455. All 425 engines were fitted with forged steel crankshafts with harmonic balancers. I agree, however the 326 was not a standard engine for the Tempest or the LeMans as you said it was. A 1977 Oldsmobile Delta 88 served as the official Indy 500 pace car, marking the fourth consecutive year that Oldsmobile held the title. Remember the 421 Super duty's from 1961-1963, Factory rated at 373, 390, 405 and 410 horsepower. Big-block and Diesel versions also increased the 2.5in (64mm) main bearing journal to 3.0in (76mm) for increased strength. do 350/400 ponchos have a bigger potential to make power than the SBC counterparts? May 10, 2011 in General Discussion, Here is the link to Part 1 Engine Mini-Series Pontiacs 326 Prt 1 Average Guy's Car Restoration, Mods and Racing. Unlike Olds 442 where you could order a F-85 442 or a Cutlass 442, the Pontiac order form says LeMans and check here for the GTO option @ $299.00. To convert cubic inches to liters, divide the cubic inches by 61. Produced from 19681980, the Rocket 350 was entirely different from the other GM divisions' 350s. -- The Vin tag says LeMans . Take a closer look at the picture of my intake on the LeMans and tell me what you think it is. The Generation II V8 ended production in 1990. All three of these engine are from the 389 engine ( 4.06 X 3.75 ). charles coker, 1953 pontiac tech advisor. The 318-cubic-inch (5.2L) 318 was released in 1950, replacing the 308. As a result, it has a bore of 4.351 inches (110.5 mm), giving it one of the widest bores of any factory small-block V8. It has a different dimension than the 1963 Tempest V-8 though. It fits '64-'72 LeMans/GTO models and '67-'73 Firebirds. For same or less money you could have a decent 455 Pontiac which is physically the same external size and weight (within a couple pounds). The 4 barrel versions had a larger diameter harmonic damper, the 2 barrel only a balancer hub without the rubberized outer ring. It was advertised with gross power and torque ratings of 312hp (233kW) at 4600 rpm and 415lbft (563Nm) at 2800 rpm. Carfolio.com - all specifications presented on this site, their display and formatting belong to Carfolio.com. Many displacements were produced using three block sizes: "Group 1" (small), "Group 2" (mid-size) and "Group 3" (large). Rings-5/64, 5/64, 3/16 That was going to be the extent of the divisions uses for this engine. The LS platform was introduced to Pontiac with the 98-02 Trans Am's, 04-06 GTO's, and 08-09 G8's. Butler LS specializes in the LS engine as well as many swap applications. Northway sourced Oldsmobile Flathead V8 (1916-1923). It shared the same 4+12 inches (110mm) stroke as its predecessors but with a slightly larger 3+78 inches (98mm) bore. Copyright 2023, Antique Automobile Club of America. [citation needed] Most 260s were coupled to the Turbo Hydramatic 200 transmission,[citation needed] but a 5-speed manual transmission was also available in some vehicles. I never checked any dates. It sounds like you have 326 experience. Pin Dia- 0.980". Well Charles, you have part of the story right. When determining the size of an engine, you need to know the number of cylinders, the bore, and the stroke. 1959 and 1960 371s used green painted valve covers. All Oldsmobile V8s were manufactured at plants in Lansing, Michigan while the engine block and cylinder heads were cast at Saginaw Metal Casting Operations.
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