Note: This is not meant to be a replacement for sonic testing the bore thickness. Casting date on the right lower side near the freeze plug in front of the starter. There are literally hundreds of suffix codes, and I will not attempt to list them all here. In 1968 the main bearing saddles were increased in size from 2. This one produced in 1971 at Tonawanda with engine serial number 71787. You can see the rear main when you pull it apart prior to overhaul. Chevy 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.Next
Locate the Chevy identification number on the engine block. You know that it is a 350 so the only other thing would be if you were overhauling it if it is a one piece rear main seal or a two piece rear main seal. Each individual stamped character was placed in a holder and secured before the engine block was struck by the employee responsible for doing this task. V8 codes are stamped on a pad just forward of the right side passenger cylinder head. Used interchangeably with 3858180 in some applications. Beginning in late 1969 model year, 3-letter engine suffix codes were used on the engine pad. We will start with the block casting number, which is from 6 to 9 digits long.Next
Beginning about 1969 the suffix code became mostly three characters instead of one or two. You can identify a Chevy by the numbers on its engine block, recorded in an official Chevy engine block registry. Has 'tall tower' distributor casting boss. The prefix consists of five digits and explains the date and the location of the Chevy's manufacture. The rear hole has a machined surface and is used to mount the pivot ball for a manual transmission clutch release cross-shaft. If your block has been decked to help raise the compression or just to true up the head mounting surface, the numbers may have been removed during the process. But numbers correct is not numbers matching.
The engine date must precede the car build date, otherwise something is amiss. The year is not specifically stamped. Hi Everyone, As you can tell I'm new to this forum. The engine code and partial vin will accurately nail down whatever the thing is rather quickly, and the other information will fall into line with that. Again, it either matches or it doesn't. Open 100cc Vortec7400 10487052 1977-90 366 Open.Next
If they don't, then it's not a number matching car! Use of either style head requires that the correct pistons are used, otherwise. If it fits the walls are probably not thick enough to bore to 4. Look for the identification number on the engine block. I purchased a 1966 Chevy C10 pick up with a Chevy 350 put in it. If the engine is still in the truck it will be a little hard to see it. Chevy is as American as baseball and apple pie.Next
It's reported that some early blocks have been found with three digits representing the month, day, and year. Is there another set of numbers stamped there? The crank is also a puzzle, it is a cross drilled, grooved crank, and I thought Chevy had stopped grooving the cranks. I was told there is a number stamped on the rear of the block unfortunately I do not know which side drivers or passengers and the rear of the block is almost against the firewall. This pointer indicates this block was cast first hour of the first shift, or 7:00 to 8:00 A. Courtesy Todd Burke 1969-1972 402 block casting number 3969854.Next
Casting date on the right lower side near the freeze plug. Parts cast at the beginning of the shift would have the pointer pointing to the double-dot position as shown in the photo. Plus the later engines had a one piece rear seal and the early engines had a two piece rear seal. The body of a Chevy is easily identifiable by shape, size and select characteristics. Select the portion of the alphabet for your code.Next
Other than curiosity does it really matter? Cast at the Tonawanda Engine Plant and all 3970024 engines to date have been identified as being assembled at Tonawanda. Most were cast after February 15, 1965 as that was the introduction date of the 396. Depending on the size of the engine, the location of the identification number will vary. Mid '70s-up blocks use the short, fat pad top example in the picture below. This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing.Next