Just think that before the lumps were ever thought of that this was the main way these heads were ported. And yes you get as much of a gain from it as you do installing the lumps also. Tom's testing didn't show there was any lag or delay in power from the lump/no lump tests within the same head or cam combos. But yes, also adding the lumps did bump the power a little higher than the same head with only the bosses removed and everything else remaining the same. But while your already this far, it doesn't cost much more to go ahead and install the lumps.
