Can someone tell me how to figure my comp ratio? It's a standard bore and stroke 427 BBC (It hasn't been bored out yet). TRW L-2300F forged pistons and 92cc iron heads. Thanks in advance. I believe it would be around 10.5 if it's .060 over, but it's not, so I'm guessing the comp ratio is lower with a smaller bore. I really don't know.....I'm just guessing the last part.