[alt63bird]

Originally Posted by darrell

tapered to use a donut gasket.what year was the change to donut.i had a lot of these engines back when but i cant remember when the change happened.

1 9 6 3 from what I've witnessed on T-bird 390 manifolds, as the C2SZ versions were flat for the flange-type pipes - I alluded to that in my previous post but wasn't specific about that fact. People also need to be aware that there were differences between Galaxie and T-bird exhaust manifolds in the early '60s, at least for '61. The big difference I've found is that the T-bird manifolds had a threaded opening in the top of the manifolds to accept an eye bolt used with a hook/overhead conveyor line during engine drop at Wixom Assembly, while at least one '61 C1AE manifold I documented had this 'nub' filled in as they used another method.