Head Torque
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Head Torque

  1. #1
    Canoe Jockey Michael Thomas's Avatar
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    Default Head Torque

    I was reading about a engine build. They ran the engine to temp and allowed it to cool down then re-torqued the heads. Aren't heads torqued hot?
    "If you can't dazzle them with brilliance...Baffle them with bullshit"

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    Senior Member 74Bonneville's Avatar
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    Everything I've read is cold. In my mind if the engine is hot and I torque it, when it cools it will be loose. Heat expands & cold contracts. At start up that cannot be a good thing.

    I'm sure their will be way more experienced engine builders to explain the proper way.

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    Senior Member 67weiman's Avatar
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    Torqued after cooled down. Hell, even if I got my motor hot, it would be cooled down by time I pulled the valve covers, girdles and all the rockers to even get to the nuts. Let alone trying to not get burned by the headers...

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  6. #4
    noob kingtal0n's Avatar
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    Quote Originally Posted by 67weiman View Post
    Torqued after cooled down. Hell, even if I got my motor hot, it would be cooled down by time I pulled the valve covers, girdles and all the rockers to even get to the nuts. Let alone trying to not get burned by the headers...
    I too, suffer from a condition I have coined "header fingers" or "header hands"
    a couple of years working on small block chevys and now everytime I get my hands near heat, my hands get that feeling. I want to say it has something to do with heat shock proteins. I read in the biology books a couple different places that, when organisms including humans, encounter a high temperature- high enough to ruin (denature) proteins in the body, they will begin to transcribe (and translate) genes that produce these "heat shock" proteins which help maintain folded conformations of heat sensitive proteins in the body's cells.

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Never heard of hot re-torque...It would be plenty difficult and if ya backed them off first i bet they would be loose when it cooled down.

    On stuff that i know won't get re torqued i pull them down to about 15lb shy of the number and let them set overnight...

    Motor i have now has been apart a few times over some machine shop issues....It's been re-torqued one time....i have used re-used the head gaskets 6 times now...sounds plenty scary...lol basic mr.gasket steel shim, i scrub them down with carb cleaner and scotch brite paint both sides with 'brown stuff' sealer and haven't had any problems yet...I don't recommend it but i been getting away with it for a while....,my luck it will take dump today..lol
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  8. #6
    Senior Member ol guy's Avatar
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    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Never heard of hot re-torque...It would be plenty difficult and if ya backed them off first i bet they would be loose when it cooled down.

    On stuff that i know won't get re torqued i pull them down to about 15lb shy of the number and let them set overnight...

    Motor i have now has been apart a few times over some machine shop issues....It's been re-torqued one time....i have used re-used the head gaskets 6 times now...sounds plenty scary...lol basic mr.gasket steel shim, i scrub them down with carb cleaner and scotch brite paint both sides with 'brown stuff' sealer and haven't had any problems yet...I don't recommend it but i been getting away with it for a while....,my luck it will take dump today..lol
    I will tell you that I have re-used head gaskets more than once and never had a problem! ALOT depends on the head gasket being used and the compression of the engine, of coarse on a o-ring,shim set up not uncommon. But I have done it with Fel-pro blues with no problem! Also I torque them once and let sit for a short while and run again. But I have know idea what the O.P. is using, Could make a big difference!

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