![]() ![]() Roller or flat tappet cam, one-piece rear seal.Ĭhevy/Olds Rocket block, 4.00-4.190 bores, 2.45 mainĬhevy/Olds Rocket block, 4.00-4. Roller or flat tappet cam one-piece rear seal III, 6.0L, truckĬrossbolted block, Gen.III, 6.0L, aluminum, LS2Ĭrossbolted block, Gen.III, 5.3L, aluminum, SSR truckĬrossbolted cast iron, Gen.III, 6.0L, truck Vortec truck, Gen.I crate motors and ZZ4, roller cam, one piece rear sealĬrossbolted block, Gen.III, LS1, aluminumĬrossbolted cast iron Gen. Vortec truck, roller cam, one-piece rear seal L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"īowtie Aluminum 4.125 bore, 2.65 main journalsīowtie Aluminum 4.125 bore 2.65 main journals Target Master/Goodwrench crate motor, 2-piece rear Goodwrench crate motor 2-piece rear seal "Hecho en Mexico"Īluminum, Pontiac Super Duty version of Gen.I SBC, 4.00 bore,ģ50 mains, 2-piece rear seal, splayed caps, GTP race blockīowtie, 3.75-4.30 bores, 1 or 2-piece rear sealīowtie, 4.00-4.155 bores, 1 or 2-piece rear seal Was also used for some CE replacement blocksĬhevy II recessed oil filter boss, Used for some Chevy II CE replacement blocks Some replacement blocks had 2-bolt main caps Some Canadian assembled heavy duty truck blocks have 4-bolt main caps Some Canadian assembled heavy duty blocks have 4-bolt main caps.īowtie, Aluminum, siamesed, straight nodular iron main caps 2-piece seal, 4.00-4.150 bores, 2.45 main journalsīowtie, Aluminum, billet main caps,3.398 bore with sleeves, 2 piece rear sealīowtie Aluminum nodular iron splayed caps wet sump 4.00 bore SBC Casting Numbers and Applications Casting On the side of some later blocks the last three digits of the block casting number are cast into the block, but these are difficult to see when the engine is in a vehicle. You may see a “5.0” (305) or “5.7” (350) cast on the rear ledge of a smallblock or a “7.4” on the side of a big block 454. Also some of the later blocks have the size of the motor shown in liters. There are sometimes other individual letters found on blocks like “GM” or “CFD” for the Central Foundry Division, but they are not part of the block casting number. The block casting numbers do not have any letters in them. The number itself can have 6, 7 or 8 numeral digits. Some of the later model blocks have the casting number on the passenger side of this ledge. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing. So, your car could have been built anytime between Nov 56 and the end of 57 production.The block casting number on smallblock and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver's side. Components such as rear ends, trannys, engines, etc, usually pre-date a car's assembly date by a minimu, of 2wks, but, 6mo has been documented. Since all the components which go together to ASSEMBLE a car must be built and shipped BEFORE assembly of the car, and your rearend was built the last day of Oct, then your car could not have been built until sometimein Nov or later. The STAMPED information doesn't go on until after assembly (because there is no way to know what gears will go into the bare case when it is cast). GM14=is simply the number assigned to the mold that was usedĪB1031=(AB)gear ratio code-3.36, made at the Buffalo plant (1031)is the ASSEMBLY date-Oct 31.Īs you can see, it was about 5wks between the time the case was cast in the mold and the time it got assembled. The following is how all your info translates.įirst, YES, it would appear that your rearend is original to your car.ģ725899=Casting number for your differential case. Limited slip 3.36:1 ratio-57-AM-xxĮxample AA212 would decode a three-speed manual built on february 12 at gear& axle. Numbers were stamped on the front right side of the diff carrier The numbers on the pumpkin are as follows: I never would have found mine without help!! Someone, I can't remember who, answered with a reply containing info listed below. I just happened to shine the flashlight down at an angle. After I scrapped off all the old paint and sanded lightly I still couldn't see it. For example, axle code PX G70621 found on a 1977 Trans Am would be deciphered as PX Ring and Pinion Gear size 3.23(shown below), G Manufacturer, Chevrolet. I finally found it on the front of the pumpkin,(towards front of car), in line with the passenger side axle housing. With the help of fellow CT members I was able to locate the #. I just got done going through the same experience. ![]()
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