Mopar Reman 5.2L Longblock

3645 Views 4 Replies 3 Participants Last post by  Gen1dak
Hello All,
I have a 5.2L Mopar Reman Longblock ( that I was able to pick up at a very reasonable price. It's unused, 0 Miles, though has been sitting for about 3 yrs.

This brings me to a few questions for you guys and gals...

-Are there any problems associated with this sitting? It was sprayed with WD40, kept in and on plastic bags in a storage rental unit.

-Are there any particulars of this engine that are either good or bad? I have a 5.2L in my Ram now, and want to build or tweek this longblock to replace the current engine as she is beginning to "get tired". Nothing major, and she may have many miles left in her, but I figure I am keeping the truck, so I'd rather take this on before my backs against the wall.

Maybe mild performance upgrades or changes to improve MPG?

All advice is welcome, as I am not too much of a mechanic.
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The 318 LA has a miserably small cam. Many years ago I added a CompCams 260 High Energy cam with excellent results (there are better choices now). Mopar's own "RV" grind is a popular upgrade. My engine maintained the same fuel mileage (19 mpg back when men were men and gas was gas), but power was much better as it'd no longer fall flat above 4,000 rpm or hit a wall in 3rd gear. Any reasonable cam choice will greatly improve overall performance. Just remember to upgrade the valve springs to match that upgraded cam. Otherwise performance suffers and you could scrag a new engine with a dropped valve. Full disclosure-I also had headers and an SP2-P intake (great for mileage).
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