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High Compression Piston...PC, CP, or JE?

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JE 13.5/1 (made for/used by PR/2). Strong torque as soon as the engine hits the powerband. Better combustion pattern on the piston crown. I use 100 octane fuel (some say you can get away with premium pump gas, but I wouldn't use the 15% ethanol laced 91 octane crap we get here in Colorado.) Other than that, same as stock.

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No CP, PC was made by JE but I think Cosworth makes them. I've used JE and worked fine. Now I use Cosworth and will never look back. Best quality I've seen

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No CP, PC was made by JE but I think Cosworth makes them. I've used JE and worked fine. Now I use Cosworth and will never look back. Best quality I've seen

 

What compression ratio?

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Can you get away with premium pump gas at 12.5:1?

You can but you won't benefit from it or you might knock especially if it gets hot out

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