That is a little comforting. The 403/auto combination was the most popular by far selling 94,773 units. If you add 72 or earlier 350 cylinder heads, your compression will be abound 9.5:1-10:1. The 350 Chevy will have the most. Big Block Blocks 1965 - 1976 A high compression 403 will not shatter a stock piston, unless you are running nitrous. The smaller bearing diameters would also reduce bearing speed and thus friction. I would not recommend one for an ultimate dragstrip build up and I would avoid doing anything that greatly raised the compression especially if the block was over bored. V8-403 (Oldsmobile) A, B, C High altitude stds U3 K Mark or Dan Van Koevering 616-453-0497 or 956-3378 [extensive experience]. But never confirmed to me at this point. Intake and Carburetors aren't the problem. Buick Engine Identification, 1976-1982-- Where to find the numbers! No big deal. Block Casting Numbers: 557265-4A, 553990-4A, 554990-4A There was a shortage of 350 Olds engines, and the Cutlass line was selling like crazy, so those engines were reserved for that line. The L78/W72 Pontiac 400's were matched up with a four-speed. 1976 Engines. The big problem would be finding a solid-main block, without which this buildup would simply be a kamikaze run (i.e. The slow time reflects the axle ratio; the car has gobs of power between 70 and 100 mph. 403 CID on a $500.00 Rebuild: Without testing a wide variety of parts, we must commend Dick on the performance of this particular engine. Each MABBCO® short block is custom assembled as ordered so please allow 5 business days for build time. This ad is for a pair of complete assembled aluminum Oldsmobile cylinder heads for 350-403 & 400-425& 455 engines. Horsepower and compression limitations are due to the Siamese cylinders and windowed webs. I recommend either elongating the hole in the bearing shell or block. CID: Year: Color: Part # 225: 1964 – 1965: Blue: 250: 1966 – 1971: Gold: Y8: 330: 1964 – 1967 Big pistons and a short stroke are an excellent combination for a high-RPM engine, but the other inherent 403 weakness comes into play. Drain cooling system, radiator, block drain plugs, etc, at least every 2-3 years. The stock 403 heads have 4 additional coolant holes drilled for additional cooling, because of the Siamese bores. To further identify the year and application, move to the top and rear of the block, where the distributor is mounted. Why aren't there more of these out there kicking butt? 1. Crank-triggered ignition. Facing the front of the engine, at the top surface of the timing chain area, A billet crankshaft, but if you like living on the edge, a factory 330 steel crank could be used, though I'd want to magnaflux it about every 10-15 passes. Think about it: many on this list sing the praises of the short-stroke 400 motors - here is essentially the same motor with a better bore/stroke and a smaller/lighter block. Even though it was Oldsmobile based, they left it for Cadillac. You must insure that the cooling system is large enough and in good order. The bottom number is 34F158993. ~Read me pleeeze~ For up-front payment total on a remanufactured long block exchange engine, add the 3 figures at the right end of the table rows above. While assembling a few of these 403's, I have noticed that the oil holes in the aftermarket bearing shells don't line up with the angled feed hole in the block. That same casting number was also used on 1971 motors, 1972 motors, etc, etc. If the block is re-bored more than .020", the standard cylinder head gasket may fall into the cylinder bore chamber. If you relocated the valve centerlines in the heads, you could run some impressive valve diameters, with the result that you should be able to flow an incredible amount of air. The Edelbrock Performer small block intake has enough meat to allow the runners to be ported to match the larger big block head intake ports. Identification The ID/Code is located on the top of the left center exhaust port on each head. Then again, for all but 600HP race motors, it's not necessary; the metallurgy of the 403's is quite well done. It was a very oversquare engine, lightweight for it’s displacement. Otherwise your piston and your exhaust valve will get married, and you'll be buying them one expensive present! As far as heads are concerned, my personal choice would be a set of big block heads with big valves. Actually, it seems to me that the 403 should be a kick-@$$ motor. Depends on combustion chamber size. If you're planning to do some work to the heads (milling and exhaust port cleanup), the smog-motor J heads will be fine. This advice comes from a number of experienced Engine Rebuilders and Oldsmoholics. The 403 V8 is easily identified by the oil fill spout growing out of the front of the engine. Try to get a car with the engine … This is the reason that you see so many 350 Chevy engines in 1977 Delta 88's. Only Olds engines had this most excellent feature. Well, for that price, you'll have to stick with your stock short block, and the stock intake, carb and ignition will have to serve. The 403 is an interesting engine, technically a small block Olds based on deck height. 403's are usually the engine mentioned when windowed webs are discussed because there are rumors and some sightings of solid main web 403's. 1964-1988 Olds Gen 2 Engines - Casting Code Decoding: This chart can be downloaded by clicking on the file name at right. I have a 74 455 Olds in my 79 Trans Am that I am rebuilding. Racing Engine Blue-printing ... 455 or 403 … It was 'sort of ' designed to replace the previous use of big block engines in the BOP line. The top number is 34M220629. 403 6.0" And the long stroke 400, the 260, and 307 have bore sizes which shroud the intake valve. Small Block Blocks 1964 - 1990 5.0L is a 307 as Olds didn't make a 305, Chevy did. The walls between the cylinder are very narrow, resulting in a minimum load area for cylinder head gasket sealing. Solid main webs for 2A's only? Pontiac Date Code on the Cylinder head Reggie Horning Engine Casting Number Reggie Horning. From 1968 until 1969 these engines -- with the exception of the engine placed in the Oldsmobile Toronado -- were painted red. This will raise compression enough for premium gas. Any 350 head will raise compression a little to a lot. This code has a 2-letter prefix code followed by a 3-digit production code. V8-403 (Oldsmobile) B, C Fed. There are several reasons that attribute to this condition. Before you think about a carb I would think about an intake manifold change to an aluminum one. Also, have the exhaust flanges milled or welded and milled (as required) to ensure that the divider between the center two exhaust ports goes all the way to the flange surface. Thread starter sst1226; Start date Aug 5, 2005; S. sst1226 New member. Supposedly 403 solid main web blocks are found in the Pontiac Bonneville with the towing package, and in some 1979 Pontiac Trans Am's with a towing package. 1st photo places where codes are usually found in a 400-455 engines.... 2nd photo 403-455 olds engines (1)400 engine (2)403 engine He cross-bolted the custom main caps, supplemented with studs at the original 2 bolt locations. Blocks 1949 - 1964 A decent cam like the Mondello JM18-20, the Edelbrock Performer or even the '68 Hurst/Olds cam with new lifters and springs with a new timing chain, will make a noticeable difference as well. A letter indicates a big block, a number indicates a small block. It was 'sort of ' designed to replace the previous use of big block engines in the Buick, Oldsmobile, Pontiac line. The Olds 455 was introduced in 1968, it was developed from the Olds 425, which was a tall-deck version of the 330 engine … "4B" Code = 1977-1979 403 - … Joined Aug 5, 2005 Messages 1 Reaction score 0 Points 0 Age 41. In all the above things, the details (such as degreeing the cam, port-matching the heads and manifolds, etc) are the most important thing, and will maximize the gains you realize from these modifications. Oldsmobile re-tooled the engine foundries in early 1977. engine identification Page 1 of 1 [ 6 posts ] Previous topic | Next topic: ... i'm a new olds owner. Their combustion chambers are too large, around 83ccs. Some were actually covered up with less then 030 opening!!!!!!! Measured many times with a VC2000 computer: 0-60 7.49sec; 1/4 mi at 91.2 mph in 15.86 sec. Short Block: 1978 Olds Delta 88, Custom Cruiser, 98, Tornado If you change from a Pontiac/Olds to the Chevy the trans and accessories may have to be changes, they have different trans bolt patterns. Solid main webs would mean a much stronger bottom end. Engine Type Car Series Description Code Vin code A letter indicates a big block, a number indicates a small block. Part #554990 has been found to have open webs. But First of all, you would need a forged crank. It seems that the 403's need a constant flow of coolant to keep everything nice and square; when you let it sit, the nice cool (relatively speaking) radiator fluid keeps that thin bit of iron between the Siamese bores somewhat straight, but when it's shut down, the heat from the engine evens out, and the cylinder walls perhaps distort. V8-403 (Oldsmobile) B, C Calif. stds VA K one had the hollow casting in the main webbing and the other and more desirable was filled in. Get '72 350 heads [hard exhaust seats], install the 403's bigger 2.000 valves or even larger W30 2.072" valves, and limit your expenses. Start with a solid-main web block (if they in fact exist), completely blueprinted, and filled the lower water passages with block hardener and use a full block girdle. Thus the use of any other head requires reaming out the holes. You could probably get 8000rpm out of a 403 if you: Given that the 403 small block obviously moves as much air as the 400/455 big block, why strangle it with small block heads? Windowed main webs, and to a lesser extent, Siamese cylinders. It was also used in other applications like motor homes, boats and some industrial applications. Over the years other displacements were added. This is the reason that you see so many 350 Chevy engines in 1977 Delta 88's. You must drill these additional holes in any 350 heads for the additional cooling potential and additional protection to keep from blowing head gaskets. Might also be found in 1977 Tornadoes. Here's the casting numbers for Olds small bocks: ID/ Casting. Block Boring: 330 6.0" Needless to say, the above price estimates will not include labor, and neither of these mods are "bolt-ons", but they will be the most effective. Try to find a set of 350 heads from 1973 or earlier. Most of the Firebirds being restored today are the performance versions of the Formula and Trans Am. Aug 5, 2005 #1 On the 403 Olds motors there were 2 types. That "68-70" BS refuses to die. GMPD Hastings does not offer pistons or rings above .020" oversize. the Olds 455/403 Improved Power, Torque and Reliability Monday, April 26, 2010. The 403/auto combination was the most popular by far selling 94,773 units. can somebody tell me what the numbers mean and if it is a good block/head combo? I also recommend Copper Coating the head gaskets. The coding for these engines were QE, QJ, QK, QL, Q6, TD, TE . Those kinds of mods will go way beyond $500, though. 5 to 9 is a big block. These heads were manufactured from 1967-1969 and are found on 442’s, Cutlass, and Toronado cars of those years. The 403 is a mediocre all out performance engine. I would work a combo in the 5200/5500 max rpm range. Oldsmobile v8 engime casting numbers 260, 307, 330, 350, 403, 400, 425, 455 information. 350 6.0"
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