gMAG

iTrader: (1)

When new bearings are installed, plastigage is used to determine the clearances, after the bolts are torqued and angled.
Then, the bolts are removed, and the plastigage is measured.
Providing that clearances are correct, all bolts are (reused) reinstalled to the same specs.
So, what is the difference between this reapplication of new bolts which have been torqued and angled, and reusing an original bolt, which has been torqued and angled to factory specs?

Paul Bell

iTrader: (9)

Unless the engine had the **** beaten out of it and you're staying relatively "stock" in power levels and usage, the original bolts can be re-used.

Properly torqued/stretched rod bolts "should not" be damaged simply by their installation.

Regardless, I would change them out for new ones during a re-build. After all, you've got everything apart.

gMAG

iTrader: (1)

Thanks, Paul. That makes good sense.
I suppose that following the reasoning you've presented, that the old/used crank main bolts would have endured 'less' stretch than the old/used rod bolts.
Nevertheless, the engine is out of the car, and new bolts will be used.

chrisfrost

iTrader: (8)

If I were using new GM rod bolts I would use the old bolts for clearancing/ plastigauging and install the new 1's for final assembly ,,,,,,,,,,ARP's can be used for both as long as they're not strechted to the max the first time or 2 . Same thing for GM mains bolts ,,,,,,old 1's clearancing and mocking up ,,,,,,new 1's for final assembly . Also apparently the main cap bolts can be re-used although I bought new 1's before I knew they could be re-used ,,,,,,,,only $90 ,,,,,,,,,not

K3vin

I've asked this before~ can anybody tell me where to get new GM main bolts?

Paul Bell

iTrader: (9)

K3in, what engine do you have?

You can get GM bolts at any GM parts counter.

LS1/6 inner bolts: 12560273
Outer bolts: 12560272
Side bolts: 12556127.

gMAG

iTrader: (1)

I usually do GMPartsDirect.com....delivered to my door.