AC 45's are TOO hot without Lead in the fuel.
One can say "but they had these in the 70's Without Unleaded fuel" They also had EGR which technically "cools"the combustion..
AC R44 would be highest I would run. I changed out a LOT of the 45's at my dealership due to changes in fuel.
Alcohol in todays fuel makes your car work harder than it did when new, so why heat it more>?
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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