Chevy is as American as baseball and apple pie. The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the driver's side. The Engine Code page is where this topic is further detailed. It is a direct replacement for the original equipment. Hi Everyone, As you can tell I'm new to this forum. Not to say mistakes weren't made as the person responsible had to insure the numbers were changed for each vehicle as necessary.
Some newer V8s have it on a little machined pad just above the timing cover. The engine assembly date must precede the car build date often by a few days , otherwise something is amiss. The two-to-three character suffix tells the owner the displacement of the engine, the horsepower of the engine, and the year and model of the vehicle. V8 codes are stamped on a pad just forward of the right side passenger cylinder head. In all, over 90,000,000 small-blocks have been built in carbureted and fuel injected forms since 1955. The only guarantee is to take off the pan and look. It will be on a machined pad at the base of the distributor on straight sixes, or on the deck surface just in front of the passenger side head on V8s.
Variously, the amounts have been reported as 10% and 20%, 1% and 2%,. This list of codes is a summarization, it is not complete nor all inclusive. So what do we have so far in this example? These were done by hand and by individual character often resulting in some very strange looking engine pads. Identifying a Chevy big block engine based solely on the serial number is a straightforward task once the serial number is located and then deciphered. Decipher the Chevy engine identification number suffix. This page has basic information on it, but it's a portion of the Small Block Chevy numbers information. V8 Engine Block Casting Month Codes A - January B - February C - March D - April E - May F - June G - July H - August I - September J - October K - November L - December Date codes consists of a letter, 1 or 2 digits for the day, and 1 digit for the year such as J 25 7 would be October 25, 1967.
The Chevrolet big-block is a series of large displacement V8 engines that were developed and used in the 1950s through the 1970s. It is believed this method of identifying replacement engines stopped after the 1975 model year. Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. The clock is a circle of 10 dots, one dot for each hour of a shift usually 10 hour shifts. Anyways, that's what that circle thing is if you happen to see it on something.
Some examples: C 1 2 or C 1 62 if it's march 1st, 1962 or B 16 2 for Feb 16, 1962 The casting date is usually a day or two or three before the engine assembly date, but sometimes it's weeks or even a month or more earlier. The following numbers are the day, followed by the month. The casting numbers on the block are 3970010. The car was purchased from a friend 5 years ago, and he has had it since 1972, so the last 37 years have been accounted for. Big Block Chevy: Machined pad in front of the passenger side cylinder head or above timing chain cover. The 327 I'm working on now has that and it is my understanding that a counter exchange motor is one that was replaced under warranty. It can be done on any 3970010 or other block.
Generation I Small-Block 10036033 Small Block V8 350, 4-bolt, Goodwrench crate engine, 2-piece rear seal 10051182 Small Block V8 2 bolt, Bow Tie block, 3. 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. As far as research has shown, Chevrolet did comply. I have checked all the web sites on the internet and all of the books that I have. The identification numbers on a Chevy big block V-8 engine are on the covering of the timing chain. The crank is also a puzzle, it is a cross drilled, grooved crank, and I thought Chevy had stopped grooving the cranks. Each engine will have 3 or 4 number sequences that when combined, will identify what the engine is from.
On the straight 6 engines, it is on the back on the passenger side of the block, hidden or almost hidden by the starter motor, or along the middle bottom of the block, possibly hidden by an engine mount. Chevrolet had introduced its popular small-block V8 in 1955, but needed something larger to power the medium-duty trucks and its heavier cars that were on the drawing board. There are literally hundreds of suffix codes, and I will not attempt to list them all here. Casting numbers for Chevy V8 engines can be found at: Casting numbers for Chevy 1937-1962 stovebolt inline six blocks can be found at: and for those and newer straight 6s try: At the same area where you find the block casting number, you will also find the casting date code. The identification number consists of a seven-to-eight digit code.
Chevy Identification Numbers Chevy Identification Numbers If you have a small block Chevy engine, and need to identify any parts you have laying around, or maybe the engine that is in your truck, I think you will find the pages below invaluable. Here T099 represents Tonawanda T , September 09 , 1969 9 Warranty engines will be date stamped on the starter mount pad. Look for the identification number on the engine block. Just be sure the suffix is actually what you think it is, they can be hard to read sometimes. I believe some trucks had dished pistons.