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Must say; agree with Barry.
Although, for competition use, thermal/ ceramic coating to pistons ++ might be a good idea, but any conclusive "proof" of this I have not found.
Coated ("teflon") piston skirts; no, no. Engine treatments: Maybe a strict no to this as well, even how much they say it will cling to the metal & make it run cooler or whatever.
At 400 Hp you won't need a forged crank, neither a solid roller. If I were to choose a setup for a 400 Hp street/ weekend racer, I would go hydraulic roller, or maybe solid flat.
I have "felt" the frustration of going in a line from the pits with engine very warm and idling- getting nervous of those rollers to fail...
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