Re: header size
With a 4000 stall converter you should run no larger than a 1 1/2 primary tube, a 1 3/8 is better but tough to find unless you make them. Than use a 2 1/8 minor diameter 2 1/2 major diameter collector. These headers would work with the stall r.p.m. recovery point. Hopefully your stall speed and maximum torque are in the same range. We ran a header like this,but with a 4 barrel,with a 302 Ford and ran very well.
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