Anyone have a spare 4.2 crank lying around? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-21-2001, 12:10 PM Thread Starter
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Anyone have a spare 4.2 crank lying around?

I'm trying to locate a 258 (4.2) crank shaft that is in good condition. I am looking for one beginning in '80 I believe (not the earlier/heavier version).



-raymo
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post #2 of (permalink) Old 03-21-2001, 01:11 PM
 
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Re: Anyone have a spare 4.2 crank lying around?

stroking a 4.0? building a revver (HP)? need the rods too, i think. matt

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post #3 of (permalink) Old 03-21-2001, 01:55 PM Thread Starter
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Re: Anyone have a spare 4.2 crank lying around?

Actually, I had a 4.0 bored and stroked. The guy who built it put a spare 258 crank in it. We thought that he was going to get the one in the engine I am discarding, but it is damaged so I need to find him a replacement for the one in my new motor.

He built the motor using a 258 crank, 4.0 rods (longer than 4.2 rods), custom CNC forged pistons, 4.0 head.

-raymo
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post #4 of (permalink) Old 03-21-2001, 03:00 PM
 
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Re: Anyone have a spare 4.2 crank lying around?

watch it with those cranks raymo, that is what destroyed my old 258....

-ben....
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post #5 of (permalink) Old 03-21-2001, 03:58 PM
 
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Re: Anyone have a spare 4.2 crank lying around?

have you had a chance to run/drive that stroked 4.0? i am thinking getting a 87 comanche with 4.0 and no title to bore and stroke. it is 2wd, wrecked in the front, drives, and is free. can't decide if i want to mess with the old fuel injection and non-HO motor. any insight? thanks! matt

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post #6 of (permalink) Old 03-21-2001, 04:29 PM Thread Starter
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Re: Anyone have a spare 4.2 crank lying around?

I haven't run it yet. It should be in within a week.

I put the 4.0 head and MPI on a reman'd engine. I think the previous owner had allowed the engine to heat up, because within the first 500 miles on the new set-up I blew a hole in a piston.

I was toying with just buying a new reman'd short block, but I felt like I would be spending a lot of time/money for basically the same thing. This stroker project is costing more than I expected. I'll have to wait and see how much better I like it over the stock 4.2 block. It ran so strong when I first completed it that it's hard to imagine something that much better.


I'll be sure to post some updates once I'm running the new engine.

-ray

-raymo
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post #7 of (permalink) Old 03-21-2001, 05:00 PM
 
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Re: Anyone have a spare 4.2 crank lying around?

had the same thing ( hole in piston) happen to a remanned marshal engine from NAPA. buddy of mine put it in another buddy's jeep. ended up being a bad EGR valve. this is all second hand info. matt

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