What size headers for SBC 383

Old 09-15-2007, 06:24 AM
  #1  
lmccoll
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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.
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Old 09-15-2007, 06:45 AM
  #2  
chevguy65
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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.
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Old 09-15-2007, 09:09 AM
  #3  
zipper06
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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.

Zip.
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