What size headers for SBC 383

Old 09-15-2007, 06:24 AM
Thread Starter
Join Date: Jan 2007
Posts: 36
Default What size headers for SBC 383

Our engine is near complete, it is a SBC 383 and should make at least 550 hp. It is 12.5:1 compression, Victor jr intake, roller cam with 0.6 inch lift, 292 duration. Brodix Racerite heads.

I have an old set of 1 5/8" headers, what size do you think is best for this engine? Thanks for your help.
lmccoll is offline  
Old 09-15-2007, 06:45 AM
Senior Member
Join Date: Sep 2005
Location: ID
Posts: 1,124

With that kind of HP I would think 1 7/8" primaries on full length header would be best.

I have a 460hp engine running 1 5/8" and plan to go to 1 7/8" this winter.
chevguy65 is offline  
Old 09-15-2007, 09:09 AM
Senior Member
Join Date: Jan 2006
Location: La.
Posts: 2,890

Absolutely 1 7/8" hookers with 3 1/2 collector. i'm putting 2" on my Sonoma 406" and i'm buying a 2 1/8" weld up kit with 4" cpllector when the 434 goes in my Malibu this winter. I'm now running 1 7/8" on the 377" motor that's in the Malibu.
The 406" motor has the same lift cam as you have with flat top pistons.

zipper06 is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -