propane stroker build - JeepForum.com
 
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post #1 of 13 Old 09-30-2013, 03:34 PM Thread Starter
89GerberXJ
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So I'm building my numbers matching block to run straight propane and stroking it out in the process.

I have found as close to an itemized list of parts as I could for a propane stroker build

Jeep 4.2L 3.895" stroke crank
Jeep 4.0L 6.125" rods
CompCams 68-231-4 206/214 degree camshaft
Ported HO 1.91"/1.50" cylinder head
Keith Black IC945-030 pistons
Mill block deck 0.030"
0.040" quench height
10.9:1 CR

From
http://jeep4.0performance.4mg.com/stroker.html

So I ordered the pistons no problem.
I am now going to order the 258 crankshaft but I can only find them for ~$450. So to save a few $ I'm gonna order it from a friend that works at carquest to get it a little cheaper.
Now at carquest they need casting numbers to order the right one.

I know that I want the later year 4.2L I6 crank since it has the 2" snout instead of the 2.5" just so I don't have to get the 3/8" spacer for it.

The 89" wrangler came with the 4.2L and has the 2" snout.

Does anybody know the casting numbers for a 4.2L from 1989?
Or from '87-'90 I believe the range is.


Last edited by 89GerberXJ; 09-30-2013 at 04:01 PM.
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post #2 of 13 Old 10-03-2013, 08:01 PM
kelso1337
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pure awesome.

Stock 2003 Jeep TJ - 'Intense Blue'
Bought the jeep in April, found JF in May...
First Mod in June.
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post #3 of 13 Old 10-04-2013, 12:19 PM Thread Starter
89GerberXJ
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Found the casting # 3727. Only managed to save $7 going through carquest. O well. I'll have it tonight
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post #4 of 13 Old 10-06-2013, 07:33 PM
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http://www.flatlanderracing.com/scat...st9000pro.html

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***** inches...
Good god man. Indyorv :rofl: d**k and fart jokes. :rofl:
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post #5 of 13 Old 10-07-2013, 12:09 AM Thread Starter
89GerberXJ
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Damn. I even looked for scat cranks. That's a great price only $359. I would take it back if I could but no need to ruin a good thing. I'm constantly buying OEM parts for drastically reduced prices so ill just take this one as helping a friend and be a little more patient next time.

4.0 connecting rods are $40 a piece through carquest so will be going through someone else for them
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post #6 of 13 Old 10-07-2013, 11:09 AM
RockRodHooligan
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Grab them out of one at the JY, look for a jeep that looks like the owner cared for it, chances are it was taken care of and probably not beaten on, and have the rods shot peened just incase. Much cheeper and stronger than getting them from a parts store.

96 XJ:Parking lot Pre-Runner

89 MJ: Project: Ground up - Sold
01 XJ: Project: Silverback - Totaled

Quote:
Originally Posted by Apex View Post
***** inches...
Good god man. Indyorv :rofl: d**k and fart jokes. :rofl:
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post #7 of 13 Old 10-07-2013, 03:00 PM Thread Starter
89GerberXJ
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I have the connecting rods from the 4.0 that came out of my xj but was not sure if they would be able to handle the added hp/torque. I figured that investing $225 on New rods would be a worthy investment now as opposed to reusing.

Do you know about how much it would cost to have the old ones pinned and blueprinted
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post #8 of 13 Old 10-07-2013, 04:56 PM
RockRodHooligan
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All depends on what's in your area, I'd say $150-ish

96 XJ:Parking lot Pre-Runner

89 MJ: Project: Ground up - Sold
01 XJ: Project: Silverback - Totaled

Quote:
Originally Posted by Apex View Post
***** inches...
Good god man. Indyorv :rofl: d**k and fart jokes. :rofl:
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post #9 of 13 Old 10-07-2013, 06:18 PM Thread Starter
89GerberXJ
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Thanks. I'll have to price out the machine shops in my area. If its $150 ill go with new. Rockauto I think has them new for $30 each.
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post #10 of 13 Old 10-07-2013, 07:55 PM
RockRodHooligan
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Link? $30 each for new connecting rods sounds like a hell of a deal. I'm having a hell of a time trying to find them on their site

96 XJ:Parking lot Pre-Runner

89 MJ: Project: Ground up - Sold
01 XJ: Project: Silverback - Totaled

Quote:
Originally Posted by Apex View Post
***** inches...
Good god man. Indyorv :rofl: d**k and fart jokes. :rofl:
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post #11 of 13 Old 10-07-2013, 08:47 PM Thread Starter
89GerberXJ
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http://www.mabbcomotors.com/catalog.php?id=1125
$30 each
$25 if you buy a set of 6


http://www.cleggengine.com/jeep-87-0...cting-rod.html
$33 each

Both I'm sure do not include shipping
Ya sorry I thought it was them. I'm always on there catalog checking stuff out.
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post #12 of 13 Old 10-08-2013, 12:08 AM
RockRodHooligan
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Clegg does pretty good work, they are where I got my crank from, but I'm going to have to say that they are not new, only remanufactured.

96 XJ:Parking lot Pre-Runner

89 MJ: Project: Ground up - Sold
01 XJ: Project: Silverback - Totaled

Quote:
Originally Posted by Apex View Post
***** inches...
Good god man. Indyorv :rofl: d**k and fart jokes. :rofl:
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post #13 of 13 Old 10-08-2013, 08:28 AM Thread Starter
89GerberXJ
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Ya. The fact that there brand new isn't as important to me as the ease of paying for a solid ready to run part.
I don't want to buy some just to put more money in it to know its solid.
I figure if I'm gonna do it I better do it right the first time.

Anyone have an opinion on cam bearings?
I want to go through and install all new bearings but am a little on edge about changing out the "good" stock bearings due to the threat of spinning if not installed correctly.

I do not have the confidence or tools to do such a job so it would be done by a "professional" at a shop with the boring and possible clearancing.
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