426 wedge

DFootCuda said

Sorry to interupt , but i have an old 413 with the horse shoe in the center of the head on intake side , what does thatt mean

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Head crossover, All Mopar heads have them, unless they are "max" heads

http://image.moparmusclemagazine.co...er_heads+factory_chrysler_big_block_heads.jpg

I believe some of the weird motorhome and heavy truck engines had special heads with WATER, not exhaust in the crossover Some of the "heavy truck" engines, both small and big block, use Ferd (18mm) spark plugs, and the RB engines have the weird water pump setup that hooks to the front of the special heads