head bolts
Thread Starter
Drifting
Joined: May 2005
Posts: 1,655
Likes: 8
From: Avon Indiana
St. Jude Donor '09
head bolts
I know your supposed to change them on a used engine but would it be ok to use the ones over on a crate engine that has never even been fired?Im just putting heads cam on a new ls6
anyone know for sure?thanks
anyone know for sure?thanks
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
but.....Did you know that the GM manual for repairs under warranty at the dealer specifies that they get reused and tq'd to 70ft lbs???!!!
I was told this by Andy at A&A.
Melting Slicks
Joined: Nov 2003
Posts: 3,396
Likes: 2
From: North Manchester Indiana
once used I would not want any dealer putting them back in my car, I would Get new , or go ARP .....
I would look into getting studs....they are good.
I would look into getting studs....they are good.
Last edited by wrustywrench; Jan 22, 2006 at 08:05 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Originally Posted by SpinMonster
but.....Did you know that the GM manual for repairs under warranty at the dealer specifies that they get reused and tq'd to 70ft lbs???!!!
I was told this by Andy at A&A.
Drifting
Joined: Oct 2004
Posts: 1,384
Likes: 8
From: Southwest Virginia
Never reuse factory LS1 head bolts, they are torque-to-yield bolts, they stretch to the yield point as they are tightened. Meaning once you put them in and torque them up, when you remove them they are longer than they were. They stretch and stay stretched, don't matter if the motor was started or not.
Ford Escorts were the first I seen to use these type bolts. Not sure if they were the first models to commonly use them, or if they were just the first models you commonly had to pull the heads on!
I would have to see that in the Manual before I believed it. 
But I would believe dealers reusing the bolts and pocketing the money from GM for new bolts. When you read the manual they almost always say to replace bolts no matter what they are for, even the non yield bolts like brake caliper bolts. Probably for liability issues.
Going to have to dig out the manual now...
Ford Escorts were the first I seen to use these type bolts. Not sure if they were the first models to commonly use them, or if they were just the first models you commonly had to pull the heads on!
Originally Posted by SpinMonster
Did you know that the GM manual for repairs under warranty at the dealer specifies that they get reused and tq'd to 70ft lbs???!!!
I was told this by Andy at A&A.
I was told this by Andy at A&A.
But I would believe dealers reusing the bolts and pocketing the money from GM for new bolts. When you read the manual they almost always say to replace bolts no matter what they are for, even the non yield bolts like brake caliper bolts. Probably for liability issues.Going to have to dig out the manual now...
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Former Vendor
Joined: Feb 2004
Posts: 9,615
Likes: 13
From: Burlington NC
Ok so you spent big money on a crate motor for you big money Corvette. Then on top of your big money crate motor you spent big money on a head+cam package. Then you are going to park your big money car in your big money garage (nice floors by the way) and then you are going to try and save a few bucks on bolts. You can most likely get away with it but why. Do your self a favor and buy new bolts or big money ARP studs. Then you will have to worry if you did the right thing or not.
Randy
Randy
Thread Starter
Drifting
Joined: May 2005
Posts: 1,655
Likes: 8
From: Avon Indiana
St. Jude Donor '09
thanks randy, i think the floors are more work than the corvette 
how much are new bolts by the way?50 bucks? just wondering and what might be the best way to figure pushrod length? do i need a setup checker? thanks,Normand
how much are new bolts by the way?50 bucks? just wondering and what might be the best way to figure pushrod length? do i need a setup checker? thanks,Normand
Racer
Joined: Jul 2005
Posts: 381
Likes: 0
From: bluff city tn.
the gm service manual says to replace the bolts i work at a dealer as a master tech. no one at are dealer do that we pride on are work!!! never heard of a dealer doing that even gm tec will tell you to replace the bolts gm is not that cheap just my 2 cents 
