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Old 03-15-2012, 05:54 AM
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roadkill2
Senior Member
RACING JUNKIE
 
Join Date: Jan 2012
Posts: 628
Default What Octane rating?

Just to keep discussion going, We're running a 498" BBC, Dart 360's with roughly 14.7-15:1 comp ratio (SWAG) at high altitudes and bad air (7200'-8600' corrected). I'm thinking 40° to 44° of lead, so where are we at?

We have a choice of either 112 octane or 116 octane, and the boss and I had a debate about which one we should use. I'm advocating 116 although I think we could get by pretty easy with 112 . . with the ignitions all of us use today, getting it ignited really isn't any kind of a problem . . and at this point, anyway, price really isn't a factor . .

Just as a reference point, last year we were running a 468 with a lot of leakdown (so compression points really don't come into play), same heads, and used 112 with no obvious problem . .

I just want to be able to lean on it a little when the air's bad . .

Discussion?
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