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Specs for head bolt tolerances!

Hi,

 

I know you can renew the head bolts but what are the tolerances for them to check if they are out of spec?

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    Not sure what length they stretch to before they are scrap, but when I rebuilt my engine I re-used the old ones. Just put plenty of molybendum grease under the bolt heads and spacers/washers.

     

    Done 12,000 miles so far......

     

    Robert

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