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Thread: Detorquing cylinder head procedures (4.2L)?

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    Default Detorquing cylinder head procedures (4.2L)?

    I know the procedures for torquing cylinder heads on, but is there a proper detorquing technique for heads?
    Is it from the center out (like torquing the heads on)? Or is it the reverse of torquing, ie - outer bolts into the center at 1/4 turn increments?

    Thanks,
    Later, T.J.

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    darwinism at its best irish1371's Avatar
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    lefty loosey
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    See HobbyShop post.
    Last edited by HillBillE; 08-09-2009 at 22:19. Reason: spreading bad info


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    Actually, When removing the head you take the bolts out in reverse torque sequence. The reason is so the head does not warp by taking bolt out of one end first. I have seen heads warp due to this, one side would be warped. I would remove in reverse sequence but your choice

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    Senior Member HillBillE's Avatar
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    Quote Originally Posted by hobbyshopass View Post
    Actually, When removing the head you take the bolts out in reverse torque sequence. The reason is so the head does not warp by taking bolt out of one end first. I have seen heads warp due to this, one side would be warped. I would remove in reverse sequence but your choice
    Interesting. I know we did that with the old flat heads, becuase they were 'thin', I thought the newer heads, with all the webbing in them, wouldn't warp. Guess I may have been giving out bad advice!

    Have to keep this in mind!


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    old iron heads are less likely to warp then new aluminum heads

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    Thanks guys, that's what I was thinking (reverse torque bolt removal), but I figuried I would ask someone else with more engine experience than me.

    I'm still gonna check back if anyone else wants to comment whether they agree or disagree.

    Later, T.J.

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