I haven't been on for awhile...but I had my mechanic find a 'good' 3.4 engine to replace mine with...supposedly it had around 82,000 miles. I did a compression test on all the cylinders just to see what I had, here's what I found out: All the cylinders had compression within 3 or 4 of 170 EXCEPT the rear far right cylinder had compression reading of 150. Another mechanic told me that from one cylinder to another it should not differ more than 10% and this is apparently VERY close to that. He also said this could be from a sticking ring since it had not been run for a bit or it could be a dirty valve or it could be starting to have a problem. I've sunk a good chunk in this engine exchange question:
Should I be concerned with these readings? Did I buy a problem engine???
The engine does not smoke and there are no knocks or pings internally that can be heard. All gaskets have been replaced and the original mechanic said the parts all looked good before he put it all together.
Please respond those of you who know these engines and let me know your thoughts. Thanks!