Q: IH Parts sells two type of exhaust donut. IH 304 1977 needs driver side. Napa and Advanced ain't got em. I need one yesterday. What are the difference of the two donuts?
A: One has a inner sleeve that indexes in the manifold for more of a factory fit. The mesh version is slightly larger if you have larger exhaust piping.
Q: Do you have a donut exhaust gasket for a 404 in?
A: No
Q: Does the sleeve go into the manifold and will it work on 66 el camino 327 sbc
A: The sleeve goes into the manifold. Fitment to a 327 SBC is unknown as we do not specialize in Chevrolet items.