Run into a problem in converting to EFI

[bosco]

Originally posted by PKRWUD
Well, according to Comp cams, you do, but that's news to me. The cams are physically interchangeable. The cam bearing journals are exactly the same size for every Ford 5.0 ever made. The F-150 had a roller block starting in 1988, but they stuffed a flat tappet cam in there until 1992. Worked fine. I've seen cams swapped dozens of times, and the only problem that ever arises is when the distributor gear is not matched.

Take care,
-Chris

Heres a thought, and i could be totally wrong but, a roller cam has a larger base circle, but to my understanding the flat, tapped cams have a smaller base circle. On a non roller block, the the lifters are shorter correct, so the point of these retro fit cams are they have the small base circle, to help compensate for taller lifters. If i were to put a regualr roller cam in it that had the larger base circles, than the lifter would come up too high, correct? i guess would that even matter?