BIG BLOCK CHEVROLET ENGINE IDENTIFICATION MANUAL
These are to accommodate the clutch counter shaft for vehicles equip with manual transmissions.
Since around 1964 most small block Chevys have had two threaded holes at the rear of the block on the driver’s side near the oil filter boss. The old system had mounts located on the front of the block at either side of the timing cover. The debut of the 283 in 1957 marked the end of the 265.Chevrolet went to a new motor mounting system placing the mounts near the freeze plugs on the side of the block. The very first small block Chevy, a 265 CID overhead valve v-8, did not even have a provision for an oil filter! The familiar oil filter boss on the small block came around in 56, along with an all new casting. While there were a pile of minor changes in the last 40 years to the small block Chevy, the basic design has remained the same for the years we are looking at on this site.
BIG BLOCK CHEVROLET ENGINE IDENTIFICATION CODE
This code I.D.s the month, day, and the year of the casting note that this does not mean that the casting date was also the model year of the vehicle that rolled out of the factory with said engine. You will either find an alpha-numeric date code cast right into the block between the images of two screws cast into the block these are from the screws that held the date code plate while the block was being cast. (Behind & below the distributor).They can also be located on the right side of the block next to a freeze plug. Found normally on the top or the right side of the same flange that mates to the transmission bell housing. The casting date can also be very helpful in identification. Even though you may have to scrap grease and dirt away, the numbers may be seen plainly while the engine is still in the car. Numbers are raised approx 1/8 of an inch. your small block Chevy is to use the casting number found on the driver’s side rear of the block on the top flange that mates with the tranny bell housing. Small Block Chevy Engine Block Identificationīig Block Chevy Engine Block Identificationīy far the fastest and easiest way to I.D. Online engine resources (casting numbers, calculators, etc.) The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain