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+1 for Cosworth HG but the block and head should be confirmed flat by the machine shop.
There are plenty of people running the felpro for under 400hp goals.
With that said, a turbo application at 10.5 is going to be a harsher environment in the chamber, people usually drop compression for turbo. The thicker HG will knock off a bit of compression which might be desired.
I've only heard of people running 10.5 pistons on e85 engines, is that what you'll be running?
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