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Don't quote me on this but I am pretty sure that roller blocks started in 1994 for all 351s. BUT I am not totally for sure about '93. I am 99% sure that a stock 1991 351 is not a roller.
I am not for sure if this helped much but maybe somebody more knowledgeable will chime in and correct me if I am wrong.
Oops, thanks for correcting that typo. I had started out by writing that the blocks earlier than the F4TE casting were not roller compatible, then shortened it.
Well all this reinforcement will surely cement in everyone's brain that only the F4TE blocks are roller compatible. There, more reinforcement!
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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