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Old 01-31-2011, 05:39 PM   #1
Jeeper
 
Join Date: Mar 2010
Location: Oakland. Ky
Posts: 361
90 yj with no engine

Buddy is about to buy a 1990 with all drivetrain ax-15 that the seller has pulled the engine out of.

Should he put in a 4.2 with 4.0 head and fuel injection ? If so what torque/ HP should he expect ?

Or just get a 4.0 and put in it ?

No V8 plz. Just the above and why . Ty
I took the 4.6/4.7 stroker out because all the bad posts .

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Old 01-31-2011, 05:49 PM   #2
Jeeper
 
Join Date: Jan 2011
Location: Louisville KY
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I don't know the exact numbers but i know that the 4.2 with the 4.0 head and TBI has as much ( if not more) HP than a stock 4.0, and way more torque!......granted you could build a 4.0 to equal it but then you loose the reliability like with a stroker.
Now around here a 4.2 is harder to come by but if you can get ne then I would g with the 4.2

Jm2c

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Old 01-31-2011, 05:52 PM   #3
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Old 01-31-2011, 10:11 PM   #4
Jeeper
 
Join Date: Mar 2010
Location: Oakland. Ky
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Great article. Thx. Will read it all in morning
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