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Re: double hump heads on a 78 engine
461 heads will perform like a vortec head. Looks like the spring pockets have been cut to fit the bigger springs. The springs might be too much for your cam. Are they drilled for 3/8 or 7/16 studs? Do you have the rockers for them? Do they have a home porting job hiding in there? Any cracks? You've got a few questions to ask
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