Re: Edmunds head

Posted by Rusty O\'Toole On 2011/3/18 23:00:24

Most of the aftermarket suppliers offered different compression ratios for different applications. A head on a 288 would have lower compression than the same head on a 327 because of the smaller displacement.

If you wanted to be real icky about it you could measure the volume of the combustion chamber and calculate the exact ratio. But in any case I don't think you would need hi test gas even with the highest ratio.

Best idea, try it on regular and if it pings switch to hi test.