wondering what you high hp guys think on this.

at what point do i think about going from 1 5/8" primary up to 1 7/8"?

i am a little over 400 rwhp n/a now.... a bit over 500 rwhp sprayed... just curious.


debate

 

Good question, I'd like to hear the answer.

 

Me too!!!

 

i THINK there was a thread a while back that discussed this. If I get time to find it i'll post it up.
Can't really remember any specifics on it.

 

my buddy picked up 12hp and 9lb/ft torque going from 1 5/8 to 1 7/8 kooks on a ls1 f-body. cam only made 412hp 389lb/ft torque.

 

This had a few links that may be helpful.

https://www.performancetrucks.net/fo...hlight=primary

 

This might help some, too. 2nd link is a chart that shows header primary size in correlation to head exhaust port flow.

http://www.superchevy.com/technical/...exh/index.html

http://www.superchevy.com/technical/.../photo_04.html

 

Without doing any formula's, off the top of my head I'd think that a 1 3/4" primary would suffice for your set-up.

 

I agree