I am interested in confirming the following exhaust manifold part#'s for my car prior to purchasing the correct dual exhaust system that the car originally had. Today it has the xover pipe which I'll remove and add a block-off on the RH side of the manifold. The numbers seem to be correct from my research thus far and they are:
GM 579278 RH
GM 579279 LH D2

btw any part number for the manifold heat control valve that can be crossed to a new one?

The shop manual states that gaskets are not used between the C-head and exhaust manifold - is that still a valid way to install it ???

 

In my '61 flat rate book, I'm looking at LEFT side - 579279 and for the RIGHT side - 579278. If your looking for an exhaust manifold heat riser valve, then Fusick sells them brand new.

 

Thanks 59-59-59 what are your thoughts on the gasket, if any?

 

Use a gasket unless you have the mating surface on the manifold and head machined. Use anti-sieze on the bolts and torque them to spec. Make sure you retorque them after driving the car a couple of times.

 

Thanks all!