B/ND is an NHRA accepted cast iron 23 degree type chevy head. And the cast manifold must have a round butterfly no larger than 2.875. A/ND is any cast iron head and any injector, no larger that 3.150, that has a cast manifold. That's the only difference.
B/ND, What a tough index !!!!
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B/ND is an NHRA accepted cast iron 23 degree type chevy head. And the cast manifold must have a round butterfly no larger than 2.875. A/ND is any cast iron head and any injector, no larger that 3.150, that has a cast manifold. That's the only difference.
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Dirk Digler
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