Duncan_GT

Anybody have any tricks for getting more clearance on the main bearings? I have polished the crank, align honed the mains, and am using undersized bearings. Still dont have enough clearance.

Boss_Hotrod

If you have the crank machined, block line honed and use the correct bearings you should have the correct clearance. You may have to have the crank ground down to the next bearing size.

reldla1996

What clearance are you looking for, and what do you have?

Duncan_GT

I want .003", im at about .0018-.002"

mjr46

Ask jim at fordstrokers, iirc when he encounters such an issue he may mix and match undersize/oversize bearings to achieve the correct clearance.....but don't quote me on that...ask him

reldla1996

I'd be good with .0018 to .002, but I prefer them a little tighter. To get more clearance requires either expanding the bores (re-honing), or shrinking the crank (re-polishing)....

Duncan_GT

Yeah i had a thread on the corral going w him. He was saying that the hone was probably on the low side and the crank is still on the high side. Its only the 1 and 2 journals. I remeasured and theyre at .0022". Which is better, and probably ok for the streets, but i dont want to spin a bearing because of it. Im using both shells of the undersized bearings

Duncan_GT

Its a 351, i need a lot more clearancing

tinman

Scotchbrite is your friend.
Use it carefully with frequent checks of just where you really are for clearance.
Only use the finer grades.......

Duncan_GT

Thank you, i had this idea but was hesitant to use it. Should i do it on the crank journal or the bearing?