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I've had my swap done for full year now, and the mini-mill is still running EXTREMELY strong...I'm using the Hedman swap headers (which I've found are pretty much the "norm") with 1 1/2 primaries and 2 1/2" collectors...They seem to work great with this small displacement motor...However, the next mill in the works should hopefully put out around 425hp...I'm planning right now for a 355; but might "crank out" to a 383...My question is this:
If I keep the existing headers, do you think they will choke off some horsepower? How big a difference would 1 5/8" primary or even 1 3/4" primary headers (probably from Sanderson) make on an engine in this horsepower range? I'm planning for primarily street running, with limited strip use...
In addition: Is anyone out there using these larger primary size headers with the stock collumn shifter and a 700R4? If so are there any additional clearance problems?
Hopefully some experienced tuners/racers have some helpful insight in this area... THANKS!!! :thumbup:
If I keep the existing headers, do you think they will choke off some horsepower? How big a difference would 1 5/8" primary or even 1 3/4" primary headers (probably from Sanderson) make on an engine in this horsepower range? I'm planning for primarily street running, with limited strip use...
In addition: Is anyone out there using these larger primary size headers with the stock collumn shifter and a 700R4? If so are there any additional clearance problems?
Hopefully some experienced tuners/racers have some helpful insight in this area... THANKS!!! :thumbup: