increase compression ratio

Got questions? We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we help a reader overhaul his Rat motor for street/strip performance. G.T. • Keaau, HI Q: I have 1973 454 big block Chevy. It has 8.5:1 compression, stock oval port cylinder heads, a Crane PowerMax camshaft, an Edelbrock Performer