Originally Posted By fast68plymouth
Anyone know of any tests where a stock type 440-4 build was tested with a 440-6 on it??

Was it worth more than the claimed 15hp gain?




Not a 440 but back in the August 2017 issue ( I think ) Mopar Muscle dyno'd the 340 they built to basically stock specs but had roller tip rockers and mild bowl blending. It made 320 hp with stock intake , carb , cam specs and exh manifolds. They added the 6 pack setup and made 356 hp with no other changes. Ron