Lets talk headers

[Jim Hanig]

Originally Posted by Mike Pearson

I have 1 7/8 straight with 3.5 inch collectors on my 327 275/295 combo running SS/IA. Runs Ok but I think a smaller header would help. 1 3/4 step would most likely be better. Maybe even 1 5/8.

Mike on my 327 250 hp i have 15/8 13/4 3 " I tryed 13/4 to 1 7/8 3.5 moved peak power up but lost 10. I think 1 3/4 1 7/8 with 3 1/4 collector. my 250 is the small valve eng.