> (Re-using 45 year old bolts
> when I
> rebuilt the engine is probably the reason I need to replace the gasket
> now.)
Seems very unlikely to me, unless they were damaged in some fashion
(especially the threads were distorted just outside the block/nut). I drove
to work this morning with 55-year-old studs, and the previous head gasket
problem proved to be improper dimensions (apparently a factory defect).
If the threads look OK visually (not knife edged or pitted from rust) and
you can spin a new nut easily all the way down, then IMO they should be
fine.
Sorry I can't help otherwise, except to note that MMC sells 3/8-24
all-thread in grade B7 (which is slightly stronger than SAE Grade 5).
-- Randall
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