We have found with our extensive dyno testing of all the different valve sizes and lump/non-lump ports and small chamber vs. large chamber heads, that the small chamber head lost at least 10 HP minimum with every combo we tested, more on some. So the compression gain its felt doesn't justify the HP and torque loss that you also will have using this head....Thats one of those "untruths" thats always been told about those heads that needs to be exposed for what it really benefits a person expecting to use it. So don't always think that more compression = more HP!
