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I'm ideally looking to run up to 20psi through it max. After machining the CR is in the 9's which is too high and im after 8.5 ideally. Its for a Zetec turbo and its all been measured up with a ST170 gasket the thickest so machining the bowls is the only option for the amount of safe boost
we put together a 200sx engine running 9:1 (higher than standard) a few years ago and made 283bhp at 13psi on a t28. Took it to 16psi with road mapping so dont know a final figure but it was batshit