<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> 670 heads in a 455 with no dish??? You must have about 12:1 compression.....wow! What kind of fuel do you use? Are the 670s good enough for a 455? </div></BLOCKQUOTE>
Yes, it's around 12:1. I use a 50/50 mix of 93 octane unleaded and 110 octane Cam2 generally. I realise that it would ultimately harm the engine because there is inaudible detonation. But I was totally surprised that it hardly pinged at all with mostly a straight 93 octane in it. I'd say it was 80% 93 and 20% 110 when I was coming home from the cruise. For the heck of it I added even more 93 when I got home and it still barely pinged. I did end up hearing though and went back to a 50/50 mix.
Jim Butler helped me pick my cam for my combo. The other thing that changed with my newest combo is the heads were street/strip ported for the new cam. Probably lost a few CC's there too. They were basically untouched with the Ultradyne setup. I just cleaned them a little by removing casting high spots.
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