Yet, with so many partial and confusing bits of info showing up in this thread, I suppose I should have been more thorough before, or just stayed out of it. Sorry for incomplete information earlier, but this can be a very drawn-out process sometimes. Forged cranks had a much wider parting line, leaving evidence of it being ground down. A cast crank will have a simple seam mark there. The way to spot a forged Chevy crankshaft is to look at the parting line from the original mold that was used to manufacture the crank. The 302 crank was also forged instead of cast, as were some other small blocks. The special 302 crank had a shape on the flange-end of the crank like a pie with one piece cut out, whereas the 350 and other cranks had more complex shapes. However, a potential visual clue on the outside is to look at the flywheel flange on the crank. But you can't see that casting number with the oil pan in place. The crank casting number ended in " 1178," if I recall correctly. Thus, the same bore with a shorter stroke resulted in fewer cubic inches.along with a much faster revving engine.perfect for trans-am style racing. The engine used the same size rods, but pistons with a lower wrist pin position, so the piston would still rise up to the top of the cylinder bore, making good compression. The thing that made a typical 350 block into a 302 was a special crankshaft, with a shorter stroke. Keep in mind that 302, 327, and 350 Chevy V8 engines all used a 4" bore block. In researching the casting number book I wrote years ago, I learned a lot about Chevrolet casting numbers. It is the same block used for the ultra common 350 V8. It is one of the most common casting numbers for small block Chevy V8 engines from 1969 well into the 70's. NO, that casting number does NOT necessarily indicate that you have a 302.
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