Quote:
Originally Posted by Ashen L99
I don’t believe that, Texas speed and janetty racing all picked up power moving from 1 7/8 up to 2” especially above 6500. I wonder why most brand name header company’s don’t offer 1 3/4 for these cars. Kooks tried doing a stepped header from 1 3/4 up to 1 7/8 on GTOs to increase the velocity of the gasses but straight 1 7/8 headers make the same power. 1 3/4 is good for old SBCs making 205 hp.
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Watch this YouTube video of different sides headers being compared on a 427 engine where the 1 7/8 and 2" made more power than the 1 3/4" but at the end they compare the 1 3/4" vs. 1 7/8" on a canned cammed LS3 and there was no difference other than the 1 3/4" made more torque down low. So, it's not worth me having to buy another set of headers and pay another $400 to replace them again for virtually no gains and maybe even lose torque down low.
Here is the link.
https://youtu.be/O1bXPNy1Yn4