Editing SBC cylinder head identification (section)
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===Casting number=== The casting number (c/n) is cast into the head as opposed to being stamped. The casting number is usually the best thing to use to tell what a cylinder head was originally used on and its potential for performance use. When referring to the different casting numbers of Chevy heads, typically the last three digits are used because in most cases these numbers are not reused. There is always an exception to the rule; in this case it's c/n 462- which was used on no less than SIX different castings! The casting number may be out in the open where it can be easily seen, like the Pontiac V8, or somewhat harder to see but still visible without taking anything off the head, or the number can be under the valve cover or under the head where it's difficult to see without some amount of disassembly.
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