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We're working on a pair of 906 heads that will be bolted on a 383 street engine, which is perfect for this type of port work. Though we'll be porting big-block heads, our techniques can be applied to any wedge-style, V-8 cylinder head. Gasket-matching ensures a smooth transition between the intake and head, and head and headers or manifold. It's generally safe to remove enough material from the intake and exhaust ports to match the shape of the factory gasket.