Small block chevrolet id numbers


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But to get into the finer points requires digging deeper. Chevy engine casting numbers has additional info including links to several sites that have casting numbers broken down to application, etc.

The Chevy V8 block casting number is generally atop the transmission mounting area of the block. The date code will usually be found in the same area, sometimes on the opposite side from the casting number, but not always. Fortunately this is rare. Suffix codes are stamped into a small boss on the front passenger side of the block where the head and block meet.

There will sometimes be two lines of numbers and letters, later engines had just one line of numbers and letters. Mid '70s-up blocks use the short, fat pad top example in the picture below.


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  • CHEVY CASTING NUMBERS.

Early engines use the middle pad. Blocks from the '60s through the mid '70s use the bottom pad. Beginning about the suffix code became mostly three characters instead of one or two. The date code is most often found back by where the transmission bolts to the engine block, on the top side of the block. The date code generally has a letter followed by two or three numbers. The letter is the month. The next number or two numbers will be the day of the month. The last number is the last digit of the year. Hydraulic roller valve trains were used beginning in During this period, there were both roller and flat tappet non roller equipped engines available.

Some blocks came completely machined for a mechanical fuel pump. In EFI applications, these engines will have a block off plate covering the mechanical pump area.

Identifying Chevy engines

Casting number blocks have been seen both with and without mechanical pump provisions, and casting number is mostly without the mechanical pump provision. Some of the up Chevy small block engines used flat tappet i. These flat tappet blocks may have the provisions for a roller cam i. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate.

Reference: Chevy Engine Block Casting Numbers

These blocks are fine if you don't care about the roller cam. There is a flat tappet block and a roller block with casting numbers that both end in The newer Vortec era blocks up have a slightly shorter bore at the bottom, nearest the cam tunnel, as shown below left. This isn't a problem in most cases, but if a stroker crank is being considered, this should be looked into to be sure there'll be no issues due to the lack of piston support at BDC. The earliest SBC dampers had a riveted on crank pulley red arrow attached to a steel hub, as shown below.

On other SBC engines, including internally balanced stroker engines, the dampers are neutral balanced.


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  • Chevy Identification Numbers.
  • Reference: Chevy Engine Block Casting Numbers.

The differences will be in the location of the TDC line, weight, thickness and diameter of the dampers. On the SBC and externally balanced stroker engines, an OEM damper will have a scalloped portion to the outer ring which is easily seen.

Chevy engine block numbers location

Aftermarket dampers usually use a bolted on counterweight, which is also usually easily seen. Pauls28 likes this. The engine assembly date is a "stamped in" code that is stamped into the metal as opposed to a "raised" casting. These date codes are can be found in a number of locations on the block, but most often are found on a ledge that is visible when the motor is assembled. This ledge is found on the passenger side of the block deck at the front.

If your alternator is on the passenger side of the motor, the ledge on the block deck is right below it.

Throwback Thursday: Chevy Engine Block Casting Numbers

You may have to move the alternator to be able to read this engine assembly code. Some blocks have the engine assembly code on a flat portion of the block above the timing cover mating surface on the front of the block. Some very early smallblocks from the mid model years had an Engine Assembly Date which only included the last two digits of the year. It might look something like "F56FG". On later model engines the engine assembly code looks similar to this "TTR".

In this case the first letter "T" stands for an engine factory Tonawanda. The next two digits stand for the month of the year, in this example "04" or the fourth month April. The "22" stands for the 22nd day of the month. So what do we have so far in this example?

chevrolet casting numbers

The motor was assembled at the Tonawanda factory on April 22nd. The years are not given. What we have left is the "suffix code" which in this example is "TR". Chevy used one to three letters of the alphabet to code the type of engine, transmission and vehicle into the suffix code.


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  7. In later years, parts of the Vehicle Identification Number V. In that case you might see "TTR " stamped into the pad on the front passenger side of the block. Sometimes the engine V. Sometimes the stamping is found above the timing cover mating surface on the front of the block. Some of the Engine Suffix letter. The real best way is to pull the heads and measure them.

    Then you will know for sure. Just to clarify, the has a 3. Bass , Aug 25, TooMany2count , Aug 25, Thanks for the info guys I'll post those stamped numbers this evening TexasDeuce , Aug 26, Model A Vette , Aug 26, Here's one for ya's. These numbers are from the front pad. I looked up the head casting numbers and it said they are The intake valves are big on these heads. Is there any more info you guy's can give me on this motor?

    It also has a cast iron spread bore 4V intake.

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