906 casting number what are they...
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Teching In
Joined: Dec 2006
Posts: 39
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906 was the last three digits of B and RB Mopar big Block heads from '68 on till they were replaced by 452's which were essentially the same except for induction hardened seats(for unleaded gas)from '73 and up. They were all open chamber w/ 2.08-1.74 valves. Contrary to popular belief, "Six Pack" and "Magnum" engines shared these same heads with all other big blocks in the Mopar family of that time.
