Stroker buildup. -
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post #1 of 4 Old 02-08-2006, 02:10 PM Thread Starter
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Stroker buildup.

Hey guys, maybe you can help me. The 4.0 is shot in my XJ, thanks to years of neglected maintenance by the original owner. I found a motor to drop in for the meantime, and I can take the original motor out and rebuild / stroke it.

Sicne the 258 and 242 are so closely related, could I buy a master rebuild kit for a 258 and then put it into the 242?

Are the cams any different in these two motors (my gut says yes)?


'94 XJ Sport 2dr.
'86 MJ
'42 Willys MB
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post #2 of 4 Old 02-08-2006, 06:15 PM
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I wouldn't be a master rebuild kit because you can do it cheaper than those kits. I built a high budget stroker but here's a break down of how to build a good cheap stroker

4.0L engine (you already got one)
258 crank, comes with rod and main bearings ($300 shipped on ebay)
258 connecting rods ($125 shipped on ebay)
piston rings ($50 shipped on ebay)
gasket set ($75 at autozone)
have a shop press the pistons to the rods ($50)

that's it, if you were to spend more, I would recomend getting the block bored, you can get a set of new pistons on ebay, in almost any overbore size, for $150 shipped

after that I'd get a cam and lifters, you will probably need new valve springs though.

o yea, get the cam bearings replaced, pay a shop to do it, it's a PAIN in the ***.

I have no idea if they had different cams.

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post #3 of 4 Old 02-08-2006, 08:43 PM
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1978 CJ5 
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Everything from simple to crazy.

As far as finding a 258 crank and rods, my local U-pull-it sells complete motors for $100. I am planning on buying 1 each 4.0 & 258 for my stroker build. I believe your best bet for a master rebuild kit would be the 4.0 HO. You will need to let the machine shop clean and check your 4.0 block & 258 crankshaft prior to ordering the kit. You might need oversized pistons and or bearings. The strokers pretty much straight 4.0 parts except for the crank and rods. Lots of cam options, one of setups on the page above uses a stock 4.0 HO cam, and late model injectors.

'00 XJ Classic > Stock DD
'88 Grand Waggy - Bone stock pseudo-barnfind
'78 CJ5 - Under minor rehab
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post #4 of 4 Old 02-09-2006, 01:41 AM Thread Starter
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Oh I know that doing cam bearings is a complete pain, been there tried not to do that. It's real nice when you have the tools.

I hadn't thought about buying a u-pull-it motor and running that, that's interesting.

I know I'm going to have to do machine work on my 4.0 block, this one is dying (leaking like a sieve and very low compression on cyl 5&6) due to probably broken rings, so at the least an overbore and hone would be needed. I've got a good reputable shop to do the machine work, so that takes care of that.

Thanks for steering me away from the master rebuild kit, I now understand.

'94 XJ Sport 2dr.
'86 MJ
'42 Willys MB
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