Dominion makes 'em for chevy's i think.....there was someone that made spherical valve heads for the 302, but i don't remember any specifics. in the sixties ford made DOHC heads that fit on a windsor block for theiur indy racing efforts, youmight be able to find a technical drawing of those you could have cast. 4 valvers would not be good for a pulling truck, low-end torque is not their specialty.
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