Re: Pontiac 400 Exhaust maifold gasket
Jason, that's the standard d-port Pontiac configuration.
The d-port verbiage comes from the fact that center two exhaust ports are one large oval, but have a dividing wall, so it looks like a couple back-to-back D's (bottom).
The round port heads have 4 large exhaust ports, all separated. Those are RAII, RAIV, and SD-455 (top).
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