Does anyone know, did offy make it's 3x2 intake in 2 different models, that is did they make a small port for the early heads and a larger port for the later heads?  If they did , do they have a way to tell them apart , other than actually looking at the ports in person. I have one on my 30' coupe, and I suspect that it is the small port manifold.  I also suspect that I have a vac. leak as it seems that the ports do not match.   The eng has C1TE  heads on it ( I know , not the best, but what I had at the time ) and a offy 3x2 intake. the intake has no markings other than Offenhauser on it. have any of you guys successfully used an offy manifold on later heads?  Thanks for any information anyone can provide.  I have a set of offy Valve covers on the eng. and like the look of having the same brand of intake on it.  The manifold and the intake are powder coated black with gold lettering.    Thanks for any help/ comments/ suggestions.-----Jim