z400

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01-20-2009, 10:44 PM

teven

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z400

I have always been told to run 91, but does it really matter, around here we have 85, 87, or 91 whats best?

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01-20-2009, 11:53 PM

sluckman

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z400

If you can afford it, buy it.

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01-21-2009, 01:35 PM

ss97

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z400

The compression ratio on a z400 is too high to run 87 octane without eventually causing valve run out..... anything over 11:1 compression should run 91 octane.....

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