Chevrolet Small V8 Cylinder Block Casting Numbers These listings are always a workinprogress If you have any documented info that can be added to these pages, please contact me and let me know Casting # CID Year Vehicle Application Notes 400 7376 Pass 2 bolt mains 400 7580 Truck 2 bolt mains8/03/18 · SBC Casting Number, 305 vs 350, Buyer BewareI remember when I bought this '78 El Camino up in New Jersey, in August 1991, the guy said his fatherinlaw put · However, from years of gathering data about these things, here is what I can tell you;
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How can you tell the difference between a 350 and 305- · Small Block V8 305, 2bolt, Vortec truck, roller cam, 1piece rear seal Small Block V8 350, 4 bolt, crate engines and ZZ4, roller cam, one piece rear seal Chevrolet Block Identification number locationsSmall Block Chevy Engine Block Identification General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes 2 blocks (3875" bore, 23" main), 302/327/350 blocks (4" bore, 23" or 245" mains), and 400 blocks (4126", 265" mains)
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· Chevy Small Block Engine Block Casting Numbers Notes (for below) "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in "Main Caps" is the number of bolts holding the cap A "twobolt" main, or a fourbolt main Four bolt main blocks are desirable in high performance applications/03/06 · I have a 305 in the car right now and bought the heads for the 305 as an upgrade They are completely redone and ready to bolt on i just found/bought a 350 engine for my car which matches up for my 71 Camaro FYI I bought the car with the 305 in it already I didnt find out until later it was a 305Guy that sold me the car stated it was a 350) · By far the easiest way would be to pull a head and measure the bore A 350 will have a 4 inch bore ( as would a 327 or a 302) while a 305 will have a 3736 in bore The difference is very pronounced once you know what you are looking at
2/03/1999 · A 305 has 45 less cubic inches than a 350, so it requires conservative camshaft selection Westech selected Comp Cam's dualpatternCHEVY CASTING NUMBERS I know that Chevy Casting Numbers are on several sites on the World Wide Web but I thought it would be a good idea to list them here too4/06/09 · A 350 & 305 have the same 348 stroke rods, crank and large journals all sbc 68 and up are all large journal so the crank will interchange but a 350 has a 400 bore and the 305 is 3736 so the blocks are the difference350's are both 2 & 4 bolt mains there is even a rare Canadian 305 truck block that has 4 bolt mains casting#
· On trucks/vans/SUVs the 305 and 350 share the same 168 tooth ring gear and the offset bolt pattern starter Some midlate 90s use a small body starter though The stamp code on the heads will let you know what the heads are from You may find 350 heads on a 305 or 305 heads on a 350Information you need from the engine code, example MMH 7=General Motor's model year in this case 1997, BUT this could also be 1987 or 1977 MH = Type of engine The 350 cid V8 Mercruiser models 57L, 350 Mag Mpi, Black Scorpion Ski, etc GM V8 305 cid (50L) – Sterndrive Models (LH rotation), flat liftersChevy Small Block V8 Engine Identification General Decoding Information This topic can be somewhat confusing, especially with the amount of information available and the interpretation of it 350
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· What's The Difference Between Chevy 305 And 350 Engines ~ Bore, Heads and more8/05/10 · If you can get a good deal on a 305 go with it the only difference like someone said earlier is the bore size the only part the would not interchange between the two is the pistons and rings literally everything else will bolt up between the two comparing apples with apples (cam, heads, compression ratio, and so on) you will be down only about 15 to 25 horses over the 350 · MANY were 4bolt mains and I'd go on assuming it's a 350 That's the most common I mean if you have a 4" bore, why not make it a 350 302's and 327's just do not make sense any more unless your trying to do something 'particular' (class limits or original engine or something) As far as being 'something similar' to a 3, ummmmm No
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/10/11 · 350 forged large two Z28, Vette,truck, some nitrided 350 steel two 2 small two 327 steel large two 400 cast XL mns two 376" stroke, ext bal 1986on 305,350 cast large one 1986on 350 forgedone truck 1986on 305,350 cast large one all 86 3509/04/10 · 2,267 Likes Received 108 Joined Jun 29, 09 Location bakersfield should be the same considering there is no phyical difference on the out side of a 305 and 350 Apr 9, 10 #6 · 352 Posts #3 · Sep 14, 09 What underramarmor said and also the 305 has a slightly weaker piston and weak valve seats, so the 325 can be abused a little bit more EGT wise From what I have read the 325 will get to 500ish rwhp easier, but the 3rd injection event makes it harder than the 305 to get the higher hp
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The 305 also became the standard V8 in GM's C/K truck series, and was even used in the Corvette for California in 1980 Crankshafts used with the 305 had the same casting number as the 350 with one discernible difference the 305 crank is lighter in weight to compensate for engine balancing · The 305 is an excellent allaround performer as well It's just a 350 with a smaller bore and makes a perfect daily driver motor In stock form, you won't notice much (if any) difference between the 307 and the 305, assuming both are mechanically sound and in a good state of tune, so either one will work for what you're afterGM might not have made the 305 as performanceoriented as its big brother 350, but they sure made a lot of them The Chevrolet 305 was the engine of choice for millions of fullsized GM cars and trucks that were too large for a V6 but didn't require a 350 just to cruise around town However, hotrodders from the
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Corvette Base MASS air 9th injector style Aluminum heads (86 and older)3/05/10 · Is there a way to tell the difference between a 305 50L and a 350 57L?This How to video will show you how to find or locate the casting numbers on your small block chevy engine block This will show you how to also look up the
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According to GM Parts Direct, 1955 to 1985 smallblock Chevrolet flywheels have a 358inch bolt pattern, whereas 1986 and later flywheels have a 3inch bolt pattern Determine the bolt pattern by measuring the distance between the bolt holes Some 350 cubicinch and smaller engineflywheels have bolt holes to accommodate both patternsThe 305 knock sensors were also different between 85 and 9092 ESC Module The 85 TPI setups used an external ESC module which was mounted by the firewall This module was different between 305 and 350 engines Changing this is as simple as disconnecting the 305 module, and plugging in a 350 moduleChevy cylinder head Identification Small block casting numbers, Big block cylinder head, camel back heads, double hump heads
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· The 305's bore was even smaller than the 375 inch bore of the 265 CID V8 which was the first smallblock Chevrolet V8 The smallblock Chevrolet 302, 327, and 350 CID V8s all share the same large bore of 4000 inches The advantage of a large bore is it makes much better use of high performance cylinder headsHope to clear the air on how to check the proper alignment of timing mark on the old school small block chevysAll 305 crankshafts are made of cast iron, so if yours is forged steel, it's a 350 crank The counter weights on the throws are going to have different amounts of weight removed either by drilled holes or shortening of the weights
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GM 305 V8 1987 260 GM 350 V8 1987 50LX (4 Barrel) GM 305 V8 50L EFI GM 305 V8 1998 50L EFI GM 305 V8 50L MPI Alpha / Bravo 50L MPI Alpha / Bravo EC 225 (2 Barrel) GM 327 V8 225 (2 Barrel) GM 327 V8 250 (2 Barrel) GM 327 V8 250 · Well I looked at the number again after I cleaned it off better with a wire wheel and sure enough it reads which is a 305 Now I'm just trying to figure out why somebody would go through the hassle of making this motor from a to a 8790 motor, because all the other ID numbers from the water pump, intake and, exhaust point to a 305 or 3502/09/10 · However, the block casting # tells the true tale, that # is a 4" bore block used to make '69 302, '6869 327, and the most common use'6980 350 This # eliminates the possibility of it being a 305, so it looks like you have a 1974 350
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· Its a good idea to use the crank in the 350 I've been told that the 305 crank is lighter, therefore you get your rpm's up faster,the boys on the dirt track swear by themCouldn't tell you about the rest though,but I wouldn't scrap all of it, ask your local engine machine shop about the rods to see if they can hold upalso you would want to use the harmonic balancer and flywheel toMatching the suffix portion of the engine ID number properly identifies the engine as a 305 or 350 cubicinch If a bore measurement is to be taken, Popular Hot Rodding identifies the 305s small bore at 3736 inches Both the 305 and 350 have the same 348inch strokeStarters are on the left (driver's) side on Olds and Pontiac and the right (passenger) side on Cadillac 425/472/500 and Buick 225/231/3800/300/340/350/400/430/455 Four bolt holes and two locator pins are common to the Chevrolet, and BOP patterns
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Small Block Chevy Engine Block Identification General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes 2 blocks (3875" bore, 23" main), 302/327/350 blocks (4" bore, 23" or 245" mains), and 400 blocks (4126", 265" mains)Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbersA Chevy workhorse for 30 years, the 350cubicinch engine was used in production models from 1968 until 1998 The engine, used interchangeably in many models, often presents identification issues that are most reliably resolved by identifying the engine code
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GM introduced the Chevrolet 305 engine in 1976 to provide a smooth driving performance while allowing for lower octane fuels and lower emissions Inspired by the popular Chevy 350, the 305 had a more narrow bore and was placed in many widebodied GM model cars The Chevrolet Camaro, Caprice, Malibu, El Camino and Monte Carlo implemented the 305Buick's first generation of V8 was offered from 1953 through 1956 It was an OHV pushrod engine like the thennew Oldsmobile "Rocket" V8It became known as the "Nailhead" by enthusiasts for the unusual vertical alignment of its smallsized valves, features that were the result of putting both intake and exhaust valves on the intake manifold side of the "pentroof combustion chamber" · I'm an Oldsmobile fanatic and I've owned many classic Olds cars Many people have been wondering how they can tell if they have an Olds small or big block engine For example, a freind of mine bought a 1984 2 door Cutlass Supreme
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· Not nit picking but those are TBI 305 heads and the HO word was dropped when those came out But I would not hesitate to run them on the 350" I really like 305 heads BUT and a big but here is I port them just a nice blend job at a minimum and kick out the chamber a bit on the intake valve side near the spark plug and around the corner away from the spark plug towardsObviously other than casting number and the VIN (the engine was swapped) Just courious if there was a way, i'm pretty sure that they 305 and 350 use the same block just smaller bore and strokeor something like thatThis preview video looks at ways to identify harmonic balancers and there specific applications, watch the entire 10 minute video at http//wwwsbfbuildingcom
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Step 1 Look at the rear of the engine block for casting numbers, by where the transmission mounts to the engine There will be at least one set of numbers on the block If you need to clean up the block to read the number, use the wire brush in combination with the degreaser305 1976 96 3736 2 bolt ONLY 307 1968 73 3875 2 bolt ONLY 327 4001 (23" main) 2 bolt 350 1968 4001 (23" main) 2 bolt 265 1994 4001 (245" main) 2 bolt 302 4001 (245" main) 4 bolt 350 1966 4001 (245" main) 4 bolt 400 4126 (265" main) 4 bolt 400 4126 (265" main) 2 bolt
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