Just my 2 cents. I always retorque heads on a rebuild. Had a small block ford I replaced the heads and did not retorque the heads after intial hot run at startup. I blew one of the head gaskets. I replaced both head gaskets and retorqued after warming up. Now thats what I always do after the first warmup of a engine. Havent blown another head gasket or had a leak since.
Jeff
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