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Stock Compression?

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I'm running 13.4 compression on a 475 stroker motor. I have benn running 87 octane with no adverse effect (meaning no fuel knock) ... However it does seem to run better on 93 octane

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I am going to put in Lukes Racing 440 big bore kit and I was told that if I went with the 13.5 compression piston that I would need race gas. Is this true?

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I run race gas 111 octane and premium 91 octane mixed 50:50 in a 13.5:1 439 kit. Same one you are getting, 94.5mm piston. Never tried to run straight pump on it and won't since I have it jetted great and it runs like a raped ape right now.

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