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I don't know the flow numbers on these old Desoto heads but they did look a little backward. I ported the intakes until they needed tubed and then used smaller valves on the exhaust. Since the motor will be turboed I'm not too worried about intake flow. Just a little street rod that will never...

I am building an old Desoto hemi and the head bolt pattern does seem to have a lot in common with the 318s. Wilcap did make 11 sets of the Desoto aluminum heads based on the old 291s. I think they all ended up on salt flat cars. Bill