Petros wrote:It always used to be standard practice on older designed head gaskets that you had to retorque the head bolts after it had been run for a short while. THere used to be a required procedure when you bought a new car that you had to bring it back after 500-600 miles of low speed driving (no full throttle) to have it serviced; the dealer mechanics would change the "break-in" oil and retorque the head, and check all the other fluid levers, look for leaks, etc. And I made the mistake once of not retorquing the head on a 1967 Datsun 1600 convertible sports car (now a classic, but than cheap) after a rebuild. I got to replace the head gasket when it blew out at about 700 miles.
The new head gasket designs do not required it, and sometimes I would do it anyway. But I have not noticed a difference, it is just extra work. If you do it, pull back on the head bolt to break it free about 1/8 of a turn and than go to the required torque in the factory sequence.
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