head torque specs
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head torque specs
Hello, Im about to put my 2 heads together into my motor after getting rebuilt from machine shop but I could not find any torque specs anywhere on this forum or google. would anyone like to give me torque specs for the heads and the sequences of which order heads bolts goes in. other torque specs would be great too.
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#5
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29 ft-lbs is NOT the final torque for the head bolts.
the correct torque level is actually 29 ft-lbs on the first pass then an additional 90* tighter.
the correct torque level is actually 29 ft-lbs on the first pass then an additional 90* tighter.
the correct method on the LS400, like on most all cars, is several progressive tightenings leading up to the 29 ft.lb specification "in several passes" is the phraseology the service manual uses, not "on the first pass" which quite a different meaning indeed.
Also, I didn't say 29 ft. lbs.was the final torque, hopefully this is not his first time torquing a head on a vehicle, and he knows that torquing down a cylinder head is always a progressive torquing. - Since he was enlightened enough to know there is a precise torque pattern/order, he has probably built an engine before.
but just in case he didn't know this, I provided him with the applicable service manual pages, where the several passes leading up to 29 ft. lbs. as well as final torquing of another 1/4 turn on each bolt after reaching 29 ft. lbs.is fully explained in the procedure, so we're all good!
1uz head bolts are yielded on use so shouldn't really be reused.
Last edited by LScowboyLS; 01-12-13 at 01:09 AM.
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