BBC head bolt torque sequence?
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BBC head bolt torque sequence?

  1. #1
    Senior Member orange bahner's Avatar
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    Default BBC head bolt torque sequence?

    Ok I have found two different tightening sequences. Any recommendations? I have cast iron heads 990's to be exact.
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    AKA Blownjet 468 Blowncat 509's Avatar
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    two different ones? let's see em', kinda curious to see the "wrong" one!

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    Senior Member orange bahner's Avatar
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    Quote Originally Posted by Blownjet 468 View Post
    two different ones? let's see em', kinda curious to see the "wrong" one!

    Ok here they are
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  6. #4
    gn7
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    You do understand that one is a head, and the other is a manifold. Right?



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    Senior Member orange bahner's Avatar
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    sorry posted wrong one now i have to find it
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    gn7
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    Heres the point. It comes down to which way you go after you torque the first center bolt. Your next bolt can be to the front or the rear of the head. It just the same pattern, except the next bolt after the center is either to the right or left of center. When you complete the pattern, your either at the front, ot the rear of the head. Same pattern, except center, the left, the right. Or center, then right, then left. No difference.



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    Quote Originally Posted by gn7 View Post
    Heres the point. It comes down to which way you go after you torque the first center bolt. Your next bolt can be to the front or the rear of the head. It just the same pattern, except the next bolt after the center is either to the right or left of center. When you complete the pattern, your either at the front, ot the rear of the head. Same pattern, except center, the left, the right. Or center, then right, then left. No difference.
    There ya go thats the way I have always done this. Start in the middle and go in a somewhat clockwise pattern out from the starting point I will stick with this it has never failed me
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    gn7
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    Quote Originally Posted by orange bahner View Post
    There ya go thats the way I have always done this. Start in the middle and go in a somewhat clockwise pattern out from the starting point I will stick with this it has never failed me
    So, would it matter if you went clock wise, or counter clockwise? But by the numbers, the pattern would look different.



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    Quote Originally Posted by gn7 View Post
    So, would it matter if you went clock wise, or counter clockwise? But by the numbers, the pattern would look different.
    Looking at the Edelbrock Aluminum head pattern it seems to go clockwise
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    gn7
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    Thats because Vic is a righty. At the end of the day, it just doesn't matter. Same pattern, opposite direction. Whats next. Right head first, or the left.



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    I always look at it as a spiral pattern starting @#1

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    gn7
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    Quote Originally Posted by Blownjet 468 View Post
    I always look at it as a spiral pattern starting @#1
    And let me guess, end with 16.



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    Quote Originally Posted by gn7 View Post
    So, would it matter if you went clock wise, or counter clockwise? But by the numbers, the pattern would look different.
    Sure it does. Rankin better have went counter clockwise since his next race is in Australia.....clockwise works fine up here though.

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    no one has torqued heads on a 6.6 duramax have they?
    it would have you confused- back ass halfwards from anything I was used
    to doing!

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