How big of a header works on SBC ?

General engine tech -- Drag Racing to Circle Track

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hoffman900
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Re: How big of a header works on SBC ?

Post by hoffman900 » Sun Nov 12, 2017 8:38 am

Almost every header for the 604ci Crate Engines are 1 5/8" off the head, and could really be 1 1/2".
-Bob

Frankshaft
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Re: How big of a header works on SBC ?

Post by Frankshaft » Sun Nov 12, 2017 9:28 am

The answer is simply, its application specific. Run an f2r with 30 lbs of boost, or run a 440 sbc that makes 900 on motor, and then spray it with another 600, gaurentee you aren't running a 1 7/8 for max power. Restricted engines have nothing to get rid of, and don't make any power, that's why the small header is better. Simply un restric it, put a good 4 barrel intake and carb, and change the cam in that same engine, and watch it want a bigger header. The simple, but complicated answer is that its application specific.

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