Quote:

Quote:

We had custom headers built and the dyno difference was almost 50HP between the ProParts and custom..
The install is in a 71 Duster, built 440, Tunnel ram, runs high nines..
As mentioned previously check out the major tube length differences of the ProParts....

Just my $0.015..






Same collector design and dimensions? Do the flanges mate up to the ports the same?
What I'm asking is, are the only difference between the two sets primary length?



Not complicated..
Flanges, ports, diameter and collector are virtually the same.. Basic difference was that all tubes were of equal length(50").
As mentioned previously check out the mismatched length of the Pro-Parts tubes, now go check out the Hookers or others..

On a full race built 440 the mismatched header tube lengths will cost alot of hp..

Just my $0.015...