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1063816
Ive never had problems with pinging. I first used this MPFI on my stock 4.2L and no problem. I have since rebult the engine and put the 4.0L head and had the engine bored .030 over and still havent had any pinging. I use 87 octane. I know others have reported pinging but I guess I got lucky with this change.[addsig]
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