I had to switch these over to the other motor. When it spun #2 main it made some slight grooves in the crank I wasn't all warm and fuzzy feeling about, and it doesn't matter any way because the whole crank is warped .0045 . Plus it closed up the journal in the block about .015 and made the parting line between the main cap and the block all jacked up. Pretty much junk. Yea, the bolts are 7/16. Thanks for the replys.