Mark Generally head bolts have a true flater surface which maximize's the
contact area ... hardward store stuff has smooth shoulders on the hex... so
I wouldn't recommend them, That and who knows what home depot calls a grade
8 made by the lowest bidder and checked only one in a million... Automakers
have to meet the minimum standard of a warranty... and they get to spec much
better stuff on average....
As for heat.... I've fought the good fight there... finally ended up
breaking down and putting in a unit for the shop... nothing else works as
well.... and I sure wish I'd done it years earlier...
Keith Turk
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