781 heads
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781 heads

  1. #1
    I'm No Expert Shaun's Avatar
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    Default 781 heads

    Whats the going rate for these? Heads are off a running motor, probably could use new valves/springs/etc... They shouldnt have any cracks and are stock.

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    I have the same heads in (probably) the same condition. I was thinking of around $150 for the pair. ?

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    Senior Member Brendellajet's Avatar
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    You can plan on spending close to a thousand dollars to have something like that gone through and made right for a performance application. If you can do the assembly you can save some money but otherwise entry level aluminum heads are worth the cost just for the weight savings alone...

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    Well there you have it folks.

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    I'm No Expert Shaun's Avatar
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    Found a guy selling a long block for 275 with these heads. Block is std but a 2 bolt... Just wondering if it was worth it.

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    I'd jump on it if it doesn't have a hole in the side of the block. Those 2 bolts are fine for a lake boat even to 500 hp. They can easily be convered to 4 bolt if you want.

    Tim

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    I'm No Expert Shaun's Avatar
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    What i have now is pushing 500hp, i'm looking to go higher, 700 hp range maybe

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Shaun View Post
    What i have now is pushing 500hp, i'm looking to go higher, 700 hp range maybe
    A studded 2 bolt is every bit as strong as a standard 4 bolt.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Quote Originally Posted by 71hallett View Post
    A studded 2 bolt is every bit as strong as a standard 4 bolt.
    I'll disagree. It has been my experience that once you go over 600HP range with a studded 2 bolt block you will run into cap walk. If you take one apart and there is gauling on the foot of the cap and/or register then she has been walking. At this point you need to install 4 bolt caps at least on the 3 center mains. I have run into this a few times but had the chance to see it with incremental HP increase in a pull truck class years ago. As the class implemented rule changes and the power grew we watched as the "limtations" showed up.
    Chris Straub
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    3HP is an A$$ Whooping!!! JW

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by cstraub View Post
    I'll disagree. It has been my experience that once you go over 600HP range with a studded 2 bolt block you will run into cap walk. If you take one apart and there is gauling on the foot of the cap and/or register then she has been walking. At this point you need to install 4 bolt caps at least on the 3 center mains. I have run into this a few times but had the chance to see it with incremental HP increase in a pull truck class years ago. As the class implemented rule changes and the power grew we watched as the "limtations" showed up.
    I will agree with you that it also depends on application. On a motor that will load and unload yes. I have also run 700hp on a studded block with a 300 shot of nitrous and had no issues. I did change the bolts every year mind you and I did also pin the caps. But as far as breaking the block no I havent.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    I guess it would also come down to the point that by the time you buy caps, machine the block exc. you are over half way to a dart.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Quote Originally Posted by 71hallett View Post
    I guess it would also come down to the point that by the time you buy caps, machine the block exc. you are over half way to a dart.
    Agreed and finding a shop to properly do the caps is few and far between.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  15. #13
    cfm
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    Quote Originally Posted by Shaun View Post
    Found a guy selling a long block for 275 with these heads. Block is std but a 2 bolt... Just wondering if it was worth it.
    I'd buy it in a millisecond. But not for your future power goals.

  16. #14
    I'm No Expert Shaun's Avatar
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    cfm, where you located, he's local to me.

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