Head Gasket

[2ktrott]

I have a 1968 680B that I did the top end on. Case had 2 different torque specs for this year based on the size of the head bolts. Thanks to this forum I figured out that I had over torqued the heads. I have copper head gaskets and am wondering are they one shot deals. Since I over torqued the heads do I need to pull them and replace the gaskets or can I just loosen them and torque them correctly. Thanks
 

[waltdavies]

I would replace them once they have been crushed they will never seat correctly.
Walt
 

[2ktrott]

That is what my gut was saying, but was hoping it was wrong. Thanks for the quick response.
 

[Walterdavies]

No problem I tried that once on an old ford Flathead it didn't work then so i guess it won't work now,
Walt
 

[dboll]

you aren't out anything for trying to retorque them, if the fire ring is crushed and won't seal go back to plan one and re- gasket it
 

[2ktrott]

The more I think about this, since the 1st spec was 250 ft pounds and the correct one was 150 ft pounds the fire rings are certainly crushed!! I snapped a couple bolts in the process. New heads gaskets are on order.
 

[Newton Miller]

If you over torqued the bolts that much you better order a new set of bolts as well, you have streached the old ones to much.
 

[Larry Jones]

I agree that all the bolts should be replaced if you went that far over and snapped some of them. And the gasket, of course.