bb ford

what is the largest crank that can be put on a bb ford

depends on which block and w/wo using a die grinder.

4.75" will fit any block.

ESI currently has a customer running a 5.35 stroke in an Eliminator block. Lots of surgery was required along with deck plates and 8 sleeves.
Runs very hard...on season#2.
Oh...it has aluminum rods too..
Not much pan rail left.
Keith

stock block

4.500 is the biggest inexpensive forged one, some times you cam get 4.600 if you call. Anything bigger is going to be billet and expensive.

You probably better spending the extra money on an aftermarket block rather than something over 4.6 stroke.