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Don't waste money on coating pistons, I've heard they eventually flake off the skirts and plug up the rings, pretty sure pumphrey talked about it on his podcast with street diesel power. Clearances throughout the engine (especially top end) should be appropriate for a compound turbo 1300hp engine, that's important.
Anything over that number with a 6.7 is risky with out a thick sleeve, or deck plate especially with compound turbo imo...
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