GM 049

Open-chamber oval port, early '70's-80's. For a stock iron oval port flow is good. Larger valves mixed with a dual-pattern camshaft would wake this head up..

• PORT SIZE: 253
• CHAMBER: 122cc
• VALVE SIZE: 2.06 / 1.72
• PRICE: N/A
• FLOW@.100: 59 / 52
• FLOW@.200: 124 / 98
• FLOW@.300: 188 / 128
• FLOW@.400: 232 / 152
• FLOW@.500: 250 / 177
• FLOW@.600: 264 / 187
• FLOW@.700: 264 / 192
• FLOW@.800: 265 / 192