Head Torque 460
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Head Torque 460

  1. #1
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    Default Head Torque 460

    The 460 book I am using to help me re build my 460 is one of the only ones on the market. I just torqued the bolts on the first Edelbrock Performer Aluminum Head (re used, only doing this re build because of water in oil from bad exhaust) to 190 lbs per the book. For some reason, after torqueing the first one, I looked up the instructions on the internet for the edelbrock heads, and it says to torque to 135lbs!! How much trouble am I in and how do I get myself out of it? I would hope at worst to pull the bolts torqued to 190 and replace them? Am I that lucky? Thanks
    Brian

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  3. #2
    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    Quote Originally Posted by One More Year View Post
    I just torqued the bolts on the first Edelbrock Performer Aluminum Head to 190 lbs per the book. For some reason, after torqueing the first one, I looked up the instructions on the internet for the edelbrock heads, and it says to torque to 135lbs!! How much trouble am I in and how do I get myself out of it? I would hope at worst to pull the bolts torqued to 190 and replace them? Am I that lucky? Thanks
    Brian
    Brian,

    All the head bolts on one cylinder bank were torqued to 190 foot pounds, eh? Shows you how strong the OEM parts are (head bolts didn't break in two and the block theads held).

    To be prudent, remove the over-torqued head bolts and throw them in the trash. If you need replacements for your over-torqued head bolts, we have them. Inspect the cylinder head for any signs of distortion, check for flatness. Inspect the threads in the block. If all is well, reassemble the engine with non-overtorqued head bolts.

    OEM 460 head bolt torque is performed in three steps: 35/70/135 foot pounds, with each torque step being applied to all bolts on a cylinder bank in the correct pattern before stepping up to the next highest torque step.

    If it goes together without issue and runs fine, then you are very likely okay. It might be wise to do a cylinder leak-down test before starting, or at least a cranking compression test. Also, pay close attention to your engine oil (look for water in the oil at initial start-up and frequently thereafter until you are convinced that there is no other hidden damage (unlikely).

    LO

    p.s.: Good thing you don't have a BBC with the smallish 7/16 head bolts and the thin cylinder deck; the head bolts would have most certainly broken and/or you would have stripped every thread in the BBC block deck.
    Last edited by LakesOnly; 08-10-2010 at 08:37 PM.
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