How much before boring it?
Thread Starter
Teching In
Joined: Dec 2016
Posts: 5
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How much before boring it? Had the machine shop check my block (6.0), crank, and pistons. He said main and rod journals are good and I can use standard bearings. Cylinders are worn 0.002 - 0.003 thousandths. He said he would bore it at that point but it was up to me and that it would probably be ok if I didn't. He feels that .005 is the max you should go without boring it.
Sounds like its right in the middle on tolerance. My question is at what point should it be bored?
This engine was bought off of Craigslist and I don't know its history. So far no major problems.... other than I've totally stripped it down. Starting to wish I had left it alone and ran it like it was!
Thx
Sounds like its right in the middle on tolerance. My question is at what point should it be bored?
This engine was bought off of Craigslist and I don't know its history. So far no major problems.... other than I've totally stripped it down. Starting to wish I had left it alone and ran it like it was!
Thx
TECH Junkie
Joined: Dec 2012
Posts: 3,606
Likes: 1,318
From: Iowa
Mic the pistons.
A good rule of thumb is about .001" piston to bore clearance for every inch of bore when using hypers
About .0015 for forged
Bores might be worn .002 from perfect (which they likely weren't perfect from gm anyway), but if the pistons are also worn .002, those clearances combine to .004
Mic the pistons and set up a piston/bore clearance, don't just worry about the Bores alone
A good rule of thumb is about .001" piston to bore clearance for every inch of bore when using hypers
About .0015 for forged
Bores might be worn .002 from perfect (which they likely weren't perfect from gm anyway), but if the pistons are also worn .002, those clearances combine to .004
Mic the pistons and set up a piston/bore clearance, don't just worry about the Bores alone
