Thread: What header primary tube dia. for 427 strokers?
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Old 08-09-2009, 07:22 PM
Jim Vander Wal Jim Vander Wal is offline
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Join Date: Sep 2002
Location: Grand Rapids, MI
Cobra Make, Engine: FFR Challenge Car, RDI aluminum 427w
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I have 2" primaries. Firefly Performance Products headers and the only 2" set. Current production is 1 7/8" which may make more sense for street motors.

My 427 runs well at 7k rpm and makes power to the upper 6k range.

I'm also running AFR 225s and using the 3" bolt spacing. I can easily get to 9/16" nuts on studs.

Jim
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