OH!!!!!
You want to LOWER it to 9.0-1!!!
Sorry...misunderstood you, Larry.
Apologies.
Oh, yeah. 12.0-1 is racing gas territory
today. Oh for leaded Gulf No-Nox or
the Sunoco "260" of yesterday....100+
RON...."manly" octanes!!! )
Bill (he oughta know?) recommends no
higher than 9.0-1 with the stock cast
iron head using today's unleaded hi-test.
Normally, you can run a full
point higher with an alum. head on the
same octane with the same "safety factor"
(against detonation/pre-ignition) with the
same ign. advance, according to my
mech (30+ year "pro" mech).
But Bill's forte is Series A's so I'd check
with him, were I you. He's pretty
conservatively on the "safe" side when
it comes to total ignition advance so I
would ass-u-me he'd be so when it comes
to CR on today's unleaded octanes, as
well.
Cap'n. Bob
'60 :{)
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