88D21

I am looking at a replacement engine from DiscountAutoparts $1500 for longblock.
What can I use as a replacement engine if I go to a junk yard?

88pathoffroad

Ouch, that's a really high price for a used 4-cylinder engine. Any KA24 from 1987-1995 Pathfinder, pickup, minivan or even a 240SX(maybe) should work, just swap the accessories from your old one onto the new one.

Note: check on http://www.car-part.com/ for a better price in your area, I find lots and lots of engines for $750 or less with 100K or so on them. The expensive ones are rebuilt or remanufactured.

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'88 Pathfinder: 6" of lift, 33x13.50 Swamper LTB's, Rancho 9000's, L&P Stage 3 steering system, K&N, Pacesetter headers and 2.5" exhaust, Lock-Right locker, 110A alty and electric fan swap, dual batteries, 700W+ worth of PIAAs, etc.