Re: 842 aluminum heads
I've put over 40,000 miles on my L-89 Corvette which as the "842" heads installed... Never had a problem with them.
Cracking was never an issue anyway... The big problem with the early aluminum heads was the valve guides which never wanted to stay in place. The head would expand at a greater rate than the guide and it would work itself loose eventually. The solution at that time was to have the guides pinned in place.
Regards,
Stan Falenski
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