torqueing LS1 heads?
torqueing LS1 heads? what is the torque specs for the LS1 heads specially there is small bolts and other big long bolts?
i know LS1 heads/cam install from http://www.ls1howto.com but it didn't specify the torque specs for the bolts.
i'm using by the way OEM GM head bolts.
i know LS1 heads/cam install from http://www.ls1howto.com but it didn't specify the torque specs for the bolts.
i'm using by the way OEM GM head bolts.
if the motor is still in the car you are going to have lots of fun trying to get them torqued to a certain degree,the ones in the back suck *** !i got fairly close but it was very difficult for me,that's where the arp bolts are well worth what you pay for them.
Originally Posted by Shinerbock07
i believe there are two "rounds" of tightening first round you torque to 75lbs. And the second is 22 lbs..
I dont really remeber. Be sure to maake the wrench click Twice
I dont really remeber. Be sure to maake the wrench click Twice
Uhh, let's take a look at that logic
No it's first round to 22lbs (big bolts only) small bolts snug (i did 8lb)
then first pass is 90° and the second pass is 90° on every bolt but the short big one they only spin 50°.
You NEED a breaker bar and use a 6 point socket
Lastley the top little bolts go to 22 foot lbs.
LS1howto does tell you the torque value. Since you are using OEM bolts, they are Torque to Yield Bolts. Torque to whatever it says then rotate them a certain degree as specified. That is to stretch the bolts out.
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Originally Posted by jeffstar
The first round to 75, the second round to 22lbs?
Uhh, let's take a look at that logic
No it's first round to 22lbs (big bolts only) small bolts snug (i did 8lb)
then first pass is 90° and the second pass is 90° on every bolt but the short big one they only spin 50°.
You NEED a breaker bar and use a 6 point socket
Lastley the top little bolts go to 22 foot lbs.
Uhh, let's take a look at that logic
No it's first round to 22lbs (big bolts only) small bolts snug (i did 8lb)
then first pass is 90° and the second pass is 90° on every bolt but the short big one they only spin 50°.
You NEED a breaker bar and use a 6 point socket
Lastley the top little bolts go to 22 foot lbs.
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thanks for the replies. I knew it. it is that way :
1- torque all the big bolts to 22 lb-ft
2- torque all the big bolts another 90 degree turn in sequence.
3- torque the long big bolts another 90 degree turn in sequence.
4- torque the shorter big bolts another 50 degree turn in sequence.
5- torque the small bolts to 22 lb-ft in sequence.
1- torque all the big bolts to 22 lb-ft
2- torque all the big bolts another 90 degree turn in sequence.
3- torque the long big bolts another 90 degree turn in sequence.
4- torque the shorter big bolts another 50 degree turn in sequence.
5- torque the small bolts to 22 lb-ft in sequence.
the marker line trick really makes it simple to see exactly where you ended up at after turning the bolt. make sure and follow that step. that way after each step you can go back and look at all the marker lines and make sure you didnt miss a bolt somehow too.
[IMG]
[/IMG]
look at this pic you can see the arrow I used as a twist on the line idea. after torquing them all to 22ft/lbs, I drew on the arrow pointing up all around.
only note here is that this is a late model replacement block, so it has all short 15mm bolts if I remember right.
[IMG]
[/IMG] look at this pic you can see the arrow I used as a twist on the line idea. after torquing them all to 22ft/lbs, I drew on the arrow pointing up all around.
only note here is that this is a late model replacement block, so it has all short 15mm bolts if I remember right.
Joined: Dec 2004
Posts: 1,294
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From: Dallas (Richardson), TX, USA
Originally Posted by jeffstar
You NEED a breaker bar and use a 6 point socket
