[p4msi1]

I have headman headers on my 69 firebird but it wasn't easy. I cut them mostly all up and reconfigured to tubing on all but about 3 pipes. The steering box was an issue and some tapping with a hammer fixed that. No more looping around the frame. I also welded in the flowmaster ball & socket flanges, no gaskets there. They should advertize these headers to fit any engine because they sure don't fit a pontiac, (some cutting, welding, beating and banging required for proper fit). I did all that and did not gain 1 hp over the 1 3/4" headers that fit really well. So to all,... up to about 600,(maybe even more) hp keep your 1 3/4" headers on and spend your time and money somewhere else.

Steve