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 258 burnt valve
#911788
10/20/08 08:47 PM
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Joined: Oct 2002
Posts: 466
OP
Mudrunner
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My jeep is acting like it's got a burned valve. It runs really rough at idle (missing). I have not pulled the plugs or done a compression check yet but I do have a spare 258 that was rebuilt about 30K ago I was working on (its dissasembled now). If that is the problem, would I be able to stick that head on, with new lifters and pushrods, without any machine work or would that be a bad idea?
80 CJ-7.
It runs
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 Re: 258 burnt valve
[Re: jstritec]
#911789
10/21/08 04:02 AM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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Sure that'll work finr.. I betcha 99% of all head millings are useless. A slightly warped head was warped when it was ON THE ENGINE! It gave no problems then and when reinstalled it will torque down tight again. Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: 258 burnt valve
[Re: BigJim]
#911790
10/21/08 03:51 PM
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Joined: Oct 2002
Posts: 466
OP
Mudrunner
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Thanks Jim
I'm thinking if I pull the head I might as well look into a 4L head swap.
Josh
80 CJ-7.
It runs
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Re: 258 burnt valve
[Re: jstritec]
#911791
10/21/08 04:09 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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That swap can getcha into a lot of time and trouble.. I think I would pull the offending head and lap a new valve in place (leaving everything else alone) and reinstall it! Then If I wanted an engine with the 4.0 head I'd be building one in my shop to install the complete engine in the future. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: 258 burnt valve
[Re: BigJim]
#911792
10/21/08 06:46 PM
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Joined: Oct 2002
Posts: 466
OP
Mudrunner
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Jim
You're probably right. I mean if it comes down to really upgrading a 258 the best bet would be to just find a pulled 4.0 and stick that in.
Josh
80 CJ-7.
It runs
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