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Ultimate Diesel Builder's Guide - - Horse Power -

There is a lot of bench rac­ing ban­ter be­tween the ad­vo­cates of 12- and 24-valve Cum­mins heads. Gen­er­ally speak­ing, ac­cord­ing to Knisely and other sources, a stock 24-valve head will de­liver more over­all flow than a stock 12-valve, but once port­ing work starts, things can equal­ize, and it's then down to the mojo of the porter. Air­flow num­bers are hotly de­bated but don't al­ways have a di­rect horse­power equiv­a­lency. More is bet­ter, of course, but how that ex­tra air is uti­lized is key.

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