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Chris

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  1. Hi Moses, Correct on everything being original. As luck would have it I had to replace the cylinder head shortly after due to a crack and I can say for sure that none of the valves were stuck or had mushroomed stem tips. I didn't notice anything odd about the rocker arms or pivot but it might be worth another look. As you can imagine, I'm reluctant to replace anything at this point until I can identify a cause. Some research on the net revealed other folks having issues with flat tappets (apparently the market has given way to rollers and no one wants to make quality flat tappets anymore?) I'm about ready to swap this engine with a junker just to get it rolling again and then tear this engine apart and mic the lifter bores ... I'm still thinking maybe the bore is too large and the lifter is chattering instead of turning. Chris
  2. Hello all, '94 Wrangler with 2.5L, about 170K+ miles ... initially running rough under load followed by loud top end noise. Found #2 intake lifter had been beaten quite a bit by the cam lobe (which was also now quite worn). No other wear found in valve train (push rod not bent) and valve not stuck. Replaced cam and lifters but less than a 100 miles later same lifter is in same condition (contact face noticeably worn from cam lobe and engine running rough under load). I should also note assembly lube was applied to the bearing surfaces, lobes and lifter faces. Ran it in at 1500 rpm for 20 minutes. Oil pressure is good and good oil flow through lifters and push rods. The only thing I can theorize is the lifter "bearing" (hole in block where lifter sits) is oversize and lifter is "chattering" in the bearing, causing it to stick and get beat up by the cam lobe. Has anyone else experienced this? Thanks, Chris
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