Originally Posted by demented
I have been thinking that the headers I have for my car might be too small for the combination. Here's what the motor is, 622 bbc alky injected, 14 degree heads, two stages of foggers 350hp on the first 250 hp on the second with gas as enrichement, 288 in dur, 306 ex dur. My current headers are 2 3/8 dia. with a 4 1/2 collector, they are a standard style header, nothing fancy. I am thinking I might gain something by going to a 2 1/2" primary and a 5" collector, But I am thinking of a merged collector as well.
Any opinions?
Also are stepped headers something to consider, Maybe a 2 3/8" to 2 1/2" stepped header?
when I ran my 632 nitrous motor on the dyno it picked up 40 more hp going from 2 1/4 to 2 1/2 on a 500 shot of nitrous if you are going to run that much nitrous I would go with 2 1/2 all the way with a good merge collector . just my 2 -cents
