GM 290

Closed-chamber oval port, would really benefit from larger valves and port work..

• PORT SIZE: 253
• CHAMBER: 105
• VALVE SIZE: 2.06 / 1.72
• PRICE: N/A
• FLOW@.100: 60 / 47
• FLOW@.200: 122 / 90
• FLOW@.300: 172 / 118
• FLOW@.400: 214 / 138
• FLOW@.500: 244 / 160
• FLOW@.600: 257 / 174
• FLOW@.700: 260 / 184
• FLOW@.800: 263 / 188