Someone school me on header size.

doogievlg said
i just spoke with a very reputable engine builder about headers for my 360. It is a .30 over 360 with flat tops, undetermined cam, performer rpm intake and Holley 750 dp.

The builder says if I go smaller than a 1 3/4” header I will be hurting the optimal power output. It looks like TTI makes a 1 5/8” x 1 3/4” stepped header. Would this be what he is referring to?
Click to expand...
He must have in mind some real good heads and a cam that'll wind it over 6000 then.
The pipe size collector back can really screw you no matter what header primary if it's too small. Go 3" pipes, difference in power between 1 5/8 and 1 3/4 under 6000 rpm with the "average street performance" heads is small.
My thoughts..