Is it true that the b16a2 head and the b18c5 head are the same except for internals?? Could I take valves,springs,cams,etc. from the type-r and put them into my b16a2 head?? what difference in horsepower would that make. I'm thinking about boost but not sure yet. I'm installing forged pistons and rods,I'm having the b16a2 head port-n-polished now and my friend told me to put type-r parts back into it. suggestions???