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Old 08-01-2013, 05:02 AM   #1
curt68's Avatar
Join Date: Aug 2013
Location: Denton
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hey...very new here

Well, I am new here. I bought a 1990 YJ a while back and found out today that the DEAL I thought I got wasnt so much of a deal. The 4.2L was trashed!!! Already rebuilt, .060 over and a set of frozen piston rings on one of the cylinders. The rebuilder said it appears that someone put BB's in the engine because the bottom of the head was peened from something metal or very hard in the motor.
SSSOOOO...the plan is a 4.6L stroker!!!
Tell me if I am wrong....but the bottom end from a 4.2 in a 4.0 motor?
Gonna run a weber 38 DGES, header and prolly a CLIFFORD intake...unless someone has a better intake to run. Engine will be .030 over w/ shallow dish pistons. Planning on about 9.5 to 1 compression.
This is my first JEEP and I'm thinking prolly not my last.
Eventually it will wear 35's of some brand so want the motor to make the power now so wont have to worry about it later.
Any ideas on distributors?
Ok...so being new to the JEEP world....I know I prolly have about 1000 questions that have been asked by every new guy here. So I will leave my discussion open to ya'll to hopefully advise me in the right direction.

Thanks for the help in advance


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Old 08-01-2013, 06:15 AM   #2
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Location: west palm fla
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welcome to the forum. yes, you use the crank and rods from a 4.2 in a 4.0
the clifford intake is a good choice if you want to stay with a carb, i'd run a holley 390cfm instead of the weber 38.
there is a forum for strokers, they should be able to answer all your questions.
Jeep Strokers • Homepage

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Old 08-06-2013, 08:26 PM   #3
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Location: Denton
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thanks rob...i will look at the stroker page and see if they answer the questions i have.
my motor is gonna be a 1990 4.0, .030 over, block milled to bump compression up to 9.5 to 1. Im running a complete comp cam kit that is .447 lift int/exh with a 260 deg duration. I need a 258 crank cuz the one in my old motor is already turned .030/.030. my plan is an aluminum intake. i didnt know if be better to run an offy or clifford. I hear good things about both. My buddy running a weber and is completely sold on it so that was my only reference. still open on the carb. just thought the 38 DGES would be better since it flowed 400cfm. I hear it flows better at angles than the holley.
anyway, any other advice would be appreciated

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Old 08-06-2013, 11:00 PM   #4
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Join Date: May 2011
Location: Lubbock Texas
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Do as much research on the building of the stroker as you can and then enjoy. I have a FI stroker in my 88 and love it. Plenty of torque and power. Welcome to the forums and feel free to ask any questions.
Check out my build at:
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Old 08-09-2013, 12:53 AM   #5
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Location: Denton
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Just wanna build a stroker so I have plenty of power later when I get 35's on it. Having the motor built by professional with warranty. Dunno what the horsepower will be. Think it will be dyno'd before I get it back. Hoping around 200 but will see. Dunno what the torque will be but think being a stroker should be great.
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Old 08-09-2013, 12:56 AM   #6
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With tires it's not just about power gearing is just as important
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Old 08-09-2013, 01:14 AM   #7
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Location: Reno, Nevada
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Just swap in a fuel injected 4.0l, use your 4.2l crank and rod and you're golden
1989 YJ, 4.2l, Junkyard TBI with timing control, aw4, np231 JB conversions super short SYE, D30 ARB & Ford 8.8 ARB 4.56, 35x12.5r15 Goodyear MTR's, bds 3.5" springs, 1" body lift, and 1/2" Boom Shackles.
Build Thread: http://www.wranglerforum.com/f330/fi...ld-385106.html
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Old 08-09-2013, 04:59 AM   #8
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Originally Posted by BCDonny View Post
With tires it's not just about power gearing is just as important
Quote of the year.
My back yard. Sutter Buttes. Best 4 wheeling around! All private owned and few get to enjoy it's rugged beauty first hand.
1993 Jeep Wrangler YJ 2.5L AX5 Transmission Rough Country 4" Suspension Lift 27" Wildcat Tires and Stock Wheels KC Fog Lights OEM Push Guard White SmittyBilt Soft Top with Rugged Ridge Hardware CB Radio Full Sound System.....
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Old 08-14-2013, 10:30 PM   #9
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my motor was totally trashed...it looked like someone had filled the motor full of BB's. i think the guy i bought the jeep from had some enemies!!!!! the tops of the pistons were beat up worse than any motor i have ever seen. the bottom of the head was peened to the point it looked like some had beat it up with a hammer and punch!!!!!i got a 4.0 at the machine shop. got the 258 crank and new rods in the mail.
within a week or two.....fingers crossed
Ok...so what about the floppy steering wheel? I got a chilton manual and will prolly do that myself. I know someone has fixed that before cuz i cant imagine im the only one this has happened to. How hard of a fix is it? Just disassemble the column down to the 3 screws/bolts...loctite tham and put it all back together?
anyone got a speedometer they want to get rid of? mine is missing. or suggestions on aftermarket one. like the autometer one but kinda pricey on MORRIS 4X4 site. Suggestions?????

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