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I've seen 4* make a few more horses in chevy engines. So I'd be reluctant to retard the timing from the original setting.
Big Jim


Which is why I want to read to the service bulletin TSB 18-24-98, to find out the specific details. And also why it really surprised me Chrysler stopped using the knock sensor, it has always been my understanding, the ideal situation is to have as much timing as possible.

Sean

99 XJ Sport 2 Door, 4.0L, 5 speed, all stock. Daily Driver
79 F150 Standard Cab Short Box, 400ci, NP435, NP205, 35" SSRs