Good afternoon. My motor (on my 1966 Town) is a 390 but it is a 1967 two barrel engine (intake is a T code (C7TE....) which I believe means truck plant or something like that). So it is not the original motor. Not sure if the exhaust manifolds came from this motor or the one that was replaced.
How can you tell if you have the manifold with the tapered exit port to the heat riser, or the flat exit port flange (without doing the obvious and removing the nuts to the exhaust pipe and observing)? Did they standardize on the tapered ones after '65? There are two types - tapered flange (for use with the steel doughnut gasket) or the one with a flat flange (for use with a flat gasket with two small holes for the studs and one big center hole). It is difficult to see the manifold's numbers.
Also, any recommendations on where to buy? Most of the Thunderbird joints have them for about $275.00 new. Anyone ever buy one of these new ones and liked the quality?
I am bringing my mechanic all of the parts before he starts the job (yeah I know I could do it myself but this one I will let my mechanic do) and I don't know which one to buy. I am guessing it is the tapered flange that uses the doughnut gasket but maybe you folks here know for sure.
Also, when I have the passenger side manifold changed, I will be using a spacer instead of a new heat riser.
Thanks.