Sorry Randy, Even running 8000 rpm I would run the 1 5/8" tube for road race and for drag depending on combo I would still run 1 5/8' tube header.randy331 wrote:I meant header pipe size, Do you think a bigger pipe showing more cfm on the bench is going to show up as power on the engine ?
Do you think there's a connection there ?
Do I think there is a connection? I test each exhaust port the same way, all lifts without pipe, ft/sec center of flange @ .7" lift, flow with 1 5/8" pipe @ .7" lift and 1 7/8" pipe @ .7" lift. Why? I think it gives me a good Idea of what the exhaust port will do in application. Some pickup more with the big pipe than others. I think in reality the bigger pipe will show a few extra ponies but at a large loss of torque throughout the usable rpm range. I will take the usable torque please!