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Identfying chevy engines by casting numbers

The suffix codes basically tell you what the motor was originally intended for. Of the thousands of available suffix codes, this one shows 4 possible applications, ranging from a Camaro with HP to a Z with HP.

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Related Articles. Learn the firing order of a small block chevy.

Our guide covers popular SBC V8 Torque specifications so you can be sure you're getting peak performance. Picking a proper camshaft for your project can rapidly deteriorate into chaos. So many possibilities.

Want a little advice? Click here! Well, which one really gave us the most bang for the buck? Read on to find out It's time to see if all our hard work to upgrade Project Chevelle will pay off in faster lap times. We set up a little autocross course to find out. 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. 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.

Identifying Chevy engines

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. 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. These blocks are fine if you don't care about the roller cam.

Chevy engine casting numbers

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.


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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. 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. Aftermarket dampers usually use a bolted on counterweight, which is also usually easily seen. The BBC engine is externally balanced.

The can be ID'd by the balancer having the inner hub cast with an integral counterweight see image below. Like the SBC aftermarket dampers, the counterweight of a damper might be bolted to the hub.