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01. Starting off with ordering cylinder heads, you need to either find out what the combustion chamber size of the old head is or figure out what piston you have in the small-block. Most Chevy-style pistons can be identified through one of the many Chevy engine-building books or looking it up online. These particular pistons (part number 12361371) have -12cc dish and were 0.030 below the deck of the block.