GM Bow Tie

In stock form these make decent performance heads up to about .500" lift..

• PORT SIZE: 175
• CHAMBER: 55cc
• VALVE SIZE: 2.05 / 1.6
• PRICE: N/A
• FLOW@.100: 61 / 54
• FLOW@.200: 123 / 103
• FLOW@.300: 179 / 130
• FLOW@.400: 214 / 148
• FLOW@.500: 226 / 157