Not Ranked
Remember that modern aly heads are tolerant of CR 10.+ ratios, with the best street gas, particularly if colder plugs are used.
The iron heads do not conduct the heat away from the chamber as quickly and therefore really don't want to see more than 9.5 or even less if the heads are not smooth surfaced.
Aly heads are available from several suppliers, complete, at very fair prices.
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"A free people ought not only to be armed and disciplined but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."
George Washington
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