Steve61BT7
Freshman Member
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I am having some trouble with preignition "ping" on my 61-BT7. I shaved the head when I rebuilt the engine and made some other mods. I used some 110 octane racing fuel last month and it eliminated the ping entirely, but I can't stand the inconveniende and $3.50 per gallon. I tried retarding the timing - that helped but the performance was sluggish. Doesn't and MSD box claim to stop this problem? Any feedback would be appreciated.