SEALED POWER FORGED OR HYPER DEPENDS ON WHAT YOU WANT TO DO
SPRAYING OR BLOWING FORGED
NATURALLY ASPIRATED HYPER WILL MAKE IT WIND FASTER DUE TO THE LIGHTER WEIGHT
build a compression motor if going N/A! Like maybe 11:1 i made the mistake when i built my 351 and i hate it every day now! well that is till i get $600 for my new pistons.peace