Re: MMO and/or ATF in fuel
Also, how hot are you running normally? I haven't had any modern fuel issues even when i had some timing and other issues that had my 455 running at 210 degrees for a whole weekend, and it was 114 out (last summer, it was brutal). Carb was great. Was rebuilt with parts for modern fuel/alcohol though, so it wasn't eating up seals, etc.
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