Hey Supraman, nice thread.
I've kinda been bitten by the same 4.0 MPI swap bug you have and have been thinking about this for a while now. I similarly have a tired out 4.2 and want to at least rebuild the sucker, but then i was thinking as long as i'm rebuilding why don't i just add fuel injection(i have no vintage loyalty to the carburetor), so hence i'm in the same boat.
My question is which would be cheaper, even though i'll probably do the MPI either way.
Option 1 - Rebuild the existing 4.2, and in doing so add a howell TBI kit to it. I figure if your doing most work yourself and a machine shop do the block it would be around $700-900 for the block work and another 1300 for the howell kit. So around 2 grand?
Option 2 - Find a junked Cherokee from 91-96 (OBD1) and swap out the 4.0 HO engine and have it rebuilt, and then do the 4.0 swap as you've written about. I figure that a junked cherokee will be around $500-900 bucks then the rebuild would be around $700-1000. Then there is the predicament of whether or not to use an extremely overpriced Hesco harness? That sucker is like 500 bones itself. That would put you at about 2 grand not using the hesco and $2500 with the harness.
So its about the same for either type of rebuild but with the 4.0 you are going to get the HO engine which makes ~190hp (?) and the 4.2 only gets about 130hp without mods right? Plus you get MPI with the 4.0 and only TBI with the 4.2. I think its a no brainer to go with the 4.0 swap over a 4.2 rebuild with TBI.
Anyone elses thoughts on this? Did i screw up my breakdown above? Thanks!
1978 CJ7 I6, 2.5" dik cepek spring lift, 0.5" shackle lift, Cooper Discoverer S/T 33's, 1.25" Wheel Spacers.
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Whats Next: Wide track swap, winch, new seats, eventually a 4.0 mpi swap from a 90's cherokee or wrangler.