[f1builder]

not sure what you want to know but the blocks are the same as fords although i have heard some of the canadian blocks have better steel content. heads aren't worth much unless you are rebuilding and want everything stock. the only difference is the 4" crank and pistons and i think the merc cam has a little more lift than the ford. people want the cams and the cranks and the pistons. i guess it depends on what you want to do with the motor and how much you are spending on it. i just got a 51 or so merc motor and i paid 300.00 for it. the block looks great and the crank looks standard. it came with a 53 F100 truck.