That's it - I put half a bottle in the tank and then 10-13 gallons of premium gas with 10% ethanol.
My 340 has factory 10.5 to 1 style pistons (.040 over but with permatex blue gaskets that are thicker than stock) that we figured for 10 to 1 when it was built 18 years ago. I've put 20,000 miles on it in its current configuration with the crossram in the last 12 years.
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