Hi, Is it possible for a Offy 6 duece log manifold to fit all the '49, 303, -'60, 394 Olds motors. I have some speed parts cataogs and they show that both Edelbrock and Weiand made them '49-'56, '57-'58 and '59-'60. But, they do not have a listing for Offy intakes. Kelly R.
Offenhauser #4064 fits the '59-'64 engines, and #3919 fits the '49-'58 engines. Since there is such a difference in port size from '49 to '58 heads, the 3919 must have a compromise port dimension.