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38 total seem a bit much. I'v always had luck with 35 total.



it amazes me that people still do that. I was once a fool too that believed the false information that mopar "BIBLE" gave every one. causes more problems with main cap walk and lower ends. 35* is more than enough.

you can use that chart to help figure out the octane you need.
EVER CONSIDER E-85?
would solve all of your problems with out very many of its own.
good luck