This thread will document our rebuild of my 2000 Jeep WJ's engine. It had ~140k on the clock when the annoying "tick" turned into something a lot worse! I was already over at Chris's shop, getting my LA's repaired and had him take a listen. We knew it was bad, so he dropped the pan to take a look. He found about 1/5 of the #4 piston in the bottom of the oil pan. The picture makes it look a lot worse than it ended up being. Amazingly there was no damage to the cylinder wall! So I decided since I needed to replace the piston, might as well upgrade while we're in there. Plan is to go with a 4.5L Simple Stroker from Dino Saava's 4.0 performance site. I modified it a little bit b/c the 677cp pistons were hard to find. Most of the work was done in Chris's shop. I had some help from a member of jeepstrokers.com and the local Carquest Machine shop. Specs: * Jeep 4.2L 3.895" stroke crank * Jeep 4.2L 5.875" rods * Sealed Power H802CP standard bore pistons (dished to 18cc's) * 9.25:1 SCR * 7.96:1 DCR * Stock 4.0 camshaft * Port & Polish cylinder head * Mopar/Victor 0.043" head gasket * 0.081" quench height * stock injectors with stock 49psi FPR for '96 and later engines * 247hp @ 4900rpm, 300lbft @ 3500rpm (thats what Dino's site says) I also decided to bore the TB out to 62mm and replace the exhaust with a Magnaflow. The teardown pics... Engine out (it was a real PITA to get it out with 5" of lift and the ARB on the front): Getting ready for the stand, but didn't have the correct bolts We got it on the stand the following day and torn down.