k so im a day from starting a new build. havent decided where i wanna drop it into so im just starting to put the motor together. ive got a b16a2 block and a b18c1 head and manifold. what kind of power loss am i looking at using the b18 head? i had a freind who had a b16a2 block with a gsr head and he lossed alot of power. after he put the gsr head on, it ran great. thoughts?