Chevy Small Block Dyno Tests - Old School Meets New
Of course, our primary motivation for choosing the Pro 1 CNC heads is the fact that they're fully ported. The port volume on the worked-over exhaust side comes in at 85 cc, which is a full 10 cc over the regular Pro 1 head. This side flows 220 cfm at 0.600 inch lift, which combined with our cam to move burnt gases out quickly and efficiently.
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