401 crank turning

[guffey24]

machine shop says the 401 crank needs turning, local napa store is trying to convince me I need a new one

he starts going through his books, I already knew he couldnt get one, but didnt say anything

after searching, he says well I guess we will have to turn the crank, this is what I am thinking the whole time

he says looks like your going to need atleast 20 over, I am a little wary of this

the motor never had bearings or anything, it was completely stock, with stock bearings

I am a little wary about going 20 over on the crank

should I be?

[tufcj]

I'd take it to a performance shop machinist. Have him mike the journals and go from there. If it hasn't spun a bearing, and has no scratches, it should clean up at .010", maybe just a polish. The journals may also be slightly out of round, cutting the crank makes them perfectly round again.

Remember that a .010 cut only removes .005 from the surface. That isn't much.

Definitely go the bare minimum possible. It may give it another life down the road.

Bob
tufcj

[AMX69PHATTY]

for reference a sheet of notebook paper is .003-.005 thick

[jeepsr4ever]

.020 really isnt much. We have cranks welded up to go .040 after they have had a couple of bearing spun. Take that crankshaft somewhere else and get it done right.

[ironman_gq]

Had my crank done by CarQuest. it was cheaper than the local engine shops and much quicker.