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Discussion Starter · #1 ·
ok, 90 740 turbo, 253K miles, runs rough on startup, but clears up in a minute or so. lots of piston slap when cold, also lessens as it warms up.
decided to do a compression check. checked each cylinder 3 times, had just driven about 10 miles 15 minutes before I checked to make sure the engine was fully warm.

#1 - 140PSI
#2 - 120PSI
#3 - 150PSI
#4 - 170PSI

going to pull the valve cover tomorrow and make sure valve clearances are correct, head was replaced before I purchased it.

Time for a rebuild/short block?

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If what you are saying is correct, a rebuild with oversize pistons it what you need to correct this. So it's up to you if you can't stand it. 170psi is really good. My car is at about 125psi, but that's at 4500 feet of elevation. I'm not sure how much that effects that number. 120 to 170 is a pretty big spread.
 
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