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Maybe the block has been milled down that would up the compression as well
That's a good point. I know some work was done on it before I got my hands on it, but I don't know exactly what was done.

'97 Jeep Cherokee XJ, Country, Black/Gray Leather, 4.0L, 4WD Command-Track, AW-4 Auto, 3.55:1 Gears, PowerTrax No-Slip Locker, Hi Country Tow Brackets, Spectre Air Filter, 235X75R15 Goodyear Wranglers, 126K miles