Head Torque ?
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From: SOUTH LYON
Head Torque ?
Ok I had 2 take heads off cause of blown head gasket.But this was on a fresh rebuild so i was removein head bolts and lower bolts were not at desired torque and i saw the ol boy do it and he did it right.So i had heads checked and they were warped.Do u think thets why the bolts looseined up on me ?I had them reserfased and gettin rdy 2 reinstall them today.But id sleep better if i new warped heads would make head bolts loose.Oh ya also i thought head torque was 105 on a 429 ThunderJet and i just gat a book on rebuilding Ford engines and it says head torqe is 140# what is proper torqe. Thx Rick
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From: PacNW
Personally I've never heard of a warped head causing head bolts to lose their torque but stranger things have happened. First thing, you do realize that 429/460 head bolts are 2 different lengths right? Longer ones go on the bottom, shorter ones on the top. Second, you did use the correct "inside out" sequence when you torqued them right? Third, if you want to be absolutely correct you should torque them in 3 steps, first tq them all to 75#. Then go back and tq them all to 105#. Finally go back around 1 more time and tq them all to 130-140#.
Always use some type of lubricant on the threads (motor oil is fine) when installing head bolts, otherwise you run the risk of get inconsistent clamping across the head surface and blowing a gasket.
Always use some type of lubricant on the threads (motor oil is fine) when installing head bolts, otherwise you run the risk of get inconsistent clamping across the head surface and blowing a gasket.
Hotshot
Joined: Dec 2003
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From: iowa
Only one thing to add to bill's post is if you are using new head bolts, you might want to warm up the engine, then let it cool down again, and rerun all of the torques on your head bolts, the new head gasket materials are supposed to stop the need for this but it sometimes still happens, and with new bolts they can stretch a small amount, and that is all it takes to loosen them up.
Oh, and one other little thing, I actually do it in 4 step the first three just like bill said then I go back over them again the last time at the final torque setting just to make sure.
Oh, and one other little thing, I actually do it in 4 step the first three just like bill said then I go back over them again the last time at the final torque setting just to make sure.
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They might have installed the bolts dry, which can cause an incorrectly high torque reading during the install. Later, as lubricant or other fluids wick into the threads they "loosen up" relative to their initial torque setting.
Brad
Brad
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From: SOUTH LYON
kool thx guys and yes they were tightened in right order but i do remember that bolts were not lubed.But wene i did it myself today i ran each bolt diped in oil all the way in so i new there was no dirt 2 give me a false torque.Crosses fingers lol im so rdy 2 drive this truck 
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From: Kentucky
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When you chase threads, you take a tap of the right size or you can buy thread chasers and run them down all of your bolt holes to make sure that there are no debrit or dirt and that the threads are not buggered up. If any abstruction at all is present it will affect your specs.
This should always be done to all holes that will be torqued.
Your machine shop normaly does not do this unless you ask and pay extra.
This should always be done to all holes that will be torqued.
Your machine shop normaly does not do this unless you ask and pay extra.
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From: new brunswick
the downfall of the 429/460 heads is the fact that there isn't very many headbolts for the area that is trying to be clamped.in order to compensate for this shortcoming ford requires the headbolts to be torqued to a high 140lbft and there is a bigger chance for irregularities in the surface areas to cause a problem with the proper sealing of the head gasket which in turn causes all kinds of expensive problems
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