torque specs on head install
10-12-2010, 04:09 PM
#1
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torque specs on head install what ft lbs do I install the head bolts and is it the same for the top bottom and middle bolts or is there a sequence? They are 243 ls2 heads going on a iron 370 thanks.
10-12-2010, 07:33 PM
#5
ARP bolts are 3 steps to 75ft-lb for big ones and 25ft-lb for the small ones. I can get you the torque order in a second.
EDIT: order is
Small bolts at the top: 15, 13, 11, 12, 14
Middle bolts: 10, 3, 1, 5, 9
Bottom bolts by manifold: 7, 6, 2, 4, 8
I don't have the picture but thats out of the GM manual.
EDIT: order is
Small bolts at the top: 15, 13, 11, 12, 14
Middle bolts: 10, 3, 1, 5, 9
Bottom bolts by manifold: 7, 6, 2, 4, 8
I don't have the picture but thats out of the GM manual.
10-12-2010, 11:56 PM
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http://www.bowlingss.com/LS1_How_To.htm
Click on Head Replacement. Near the bottom of that page where they talk about using ARP bolts.
Click on Head Replacement. Near the bottom of that page where they talk about using ARP bolts.
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10-13-2010, 08:42 AM
#8
ARP bolts are 3 steps to 75ft-lb for big ones and 25ft-lb for the small ones. I can get you the torque order in a second.
EDIT: order is
Small bolts at the top: 15, 13, 11, 12, 14
Middle bolts: 10, 3, 1, 5, 9
Bottom bolts by manifold: 7, 6, 2, 4, 8
I don't have the picture but thats out of the GM manual.
EDIT: order is
Small bolts at the top: 15, 13, 11, 12, 14
Middle bolts: 10, 3, 1, 5, 9
Bottom bolts by manifold: 7, 6, 2, 4, 8
I don't have the picture but thats out of the GM manual.
I will add only this. IF you need to stop, complete a FULL pass so they are all equal TQ. So you dont chance warping the head. Had people I know in the past with Aluminum do a half pass and get caught up in something and to finish up days later and then have issue later in the summer.
10-13-2010, 11:00 AM
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so when running through 1-15 I start at 1 and do I torque all the way to spec? Or just go through 1-15 and snug and then go back through and torque to spec?
10-13-2010, 11:16 AM
#10
I got them all snugged because its a pain to do with a torque wrench, then started torquing. I also had to find a small torque wrench to hit the tiny bolts at 3 steps to 25ft-lb because my big one does not go that low. For those I ended up going 10, 20, 25.
10-13-2010, 01:10 PM
#11
If I was not so fearful of the bolt holes potentially cracking if there is fluid or debris, I would be using a little oil, APR bolt lube or something to ensure perfect spec. (mind you there are different opinions on this subject, so let other people chime in).
