Run a compression test

Posted by ChadS on April 15, 2005 at 10:59:56 from (4.224.132.73):

In Reply to: Re: 460 87 or 93 Octain posted by Danny H on April 15, 2005 at 08:29:55:

If the engine in that 460 has 155 or less, then 87 would be fine. 155-165 psi, maybe a 89 octane, 165+psi, 92. The 460 C-221 may not create the heat than the bigger, and newer versions of the 6 cyl. The 263's 291's in the 06's, according to the I&T manual, compression is 185-190psi. 205-210 for the LP's. The 460, had 155 psi (stock) according to the I&T book. Each engine is different, it could have an overbore kit in it, and have higher compression than what the book specs say. I say, let the compression test decide what octane to use. JMHO, ChadS

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