Re: 66' heads
xman,
The 3872702 heads were used on the lower performance engines. I.E. the Corvette 427/390, Chevelle 396/325, etc...
The heads you need are either the 3873858 (for 1966), or the 3904391 (for 1967).
Both of these are square post and would have originally been installed in a HP application, but WHICH one would depend on the build date of your car.
Ed
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Ed Bertrand
1968 RS/SS L-89
396/375 Convertible
CRG Member
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