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Unread 11-23-2012, 10:34 PM   #1
PhantomWJ
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SLOW Stroker Build

I picked up an AMC 258 a few days back. It was running before it got pulled and had relatively low miles. No leaks. No funky noises. The PO decided to install a 4.0 to replace 4.2L; his trash, my treasure.

Once I gather the appropriate bolts, it will come off the engine hoist and onto the engine stand where I will begin tear down.

I will pull the crank and rods, and slowly decide how the build will go; 4.5 or 4.6L. Nonetheless, as my 4.0 nears 200K without issues, I need a reason to dump/waste more money on it.

Any useful input is welcomed.

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Unread 11-24-2012, 08:52 PM   #2
PhantomWJ
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Opinions needed:

So i picked up a cheap 4.2L long block...unfortunately it came with the #3235477 crankshaft.........4 counterweights, 46lb, 64mm nose.

Im not completely sure what difference this makes over the 12 counterweight crankshaft, should I wait some more for the 12 counter weight or proceed?

Someone enlighten me.

Below are some picks of the tear down of the AMC 258
4.2l-long-block.jpg   4.2l-old-parts.jpg   4.2l-old-plugs.jpg   4.2l-cylinder-head.jpg   4.2l-oil-pan-off.jpg  

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Unread 12-02-2012, 02:19 PM   #3
PhantomWJ
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Zero input from anyone so I continued to disassemble the 258...

More progress...
forumrunner_20121202_131841.jpg   forumrunner_20121202_131857.jpg   forumrunner_20121202_131911.jpg  
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Unread 12-12-2012, 10:07 AM   #4
Rocklobster
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I don't have any input but if like to know how you make out.:-) good luck.
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Unread 12-12-2012, 09:41 PM   #5
PhantomWJ
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I hope not to eff it up... to date I can not find a spare block to rebuild...and I dont want to take mine out yet since it is still running...and I need a running toy...

I found the Sealed Power H802CP .020" overbore piston for like $210 shipped for the set of 6 or ...about $115 for only 5 pistons...
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Unread 12-14-2012, 11:08 PM   #6
PhantomWJ
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This is what I think I am going for:


4.6L "poor man's" stroker

Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Sealed Power 677CP +0.020" bore pistons
9.25:1 CR
Stock 4.0 camshaft
Ported HO 1.91"/1.50" cylinder head
Mopar/Victor 0.043" head gasket
0.088" quench height
Ford 24lb/hr injectors for '87-'95 engines, Accel 24lb/hr injectors for '96-'04 engines, '98 Chevy LS1 25.2lb/hr injectors for '05-'06 engines
248hp @ 4900rpm, 306lbft @ 3250rpm ('87-'95 camshaft)
245hp @ 4800rpm, 315lbft @ 3000rpm ('96-'04 camshaft)


http://jeep4.0performance.4mg.com/stroker.html
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Unread 12-14-2012, 11:25 PM   #7
PhantomWJ
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I found these Sealed Power H825CP20 Pistons Hypereutectic Dish 3.895" Bore AMC L6 Set of 6 (http://www.ebay.com/itm/Sealed-Power...sories&vxp=mtr

or I can get these

Speed-Pro Hypereutectic Pistons ZWH825CP20

http://www.summitracing.com/parts/slp-wh825cp20
or


Sealed Power Cast Pistons Z677CP20
http://www.summitracing.com/parts/slp-677cp20


My question is, what difference would one make form the there?
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Unread 12-14-2012, 11:35 PM   #8
Bama_WJ
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I'll be watching this build. I've been looking into a stroker motor or selling my Jeep and buying a V8. I can't help but think the stroker is the cheaper of the two options though. I've been looking at the 4.7 range (using .060 over bore pistons instead of .030 I assume) and a hotter cam.

Any plans to beef the transmission up?
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Unread 12-14-2012, 11:58 PM   #9
PhantomWJ
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Quote:
Originally Posted by Bama_WJ View Post
I'll be watching this build. I've been looking into a stroker motor or selling my Jeep and buying a V8. I can't help but think the stroker is the cheaper of the two options though. I've been looking into the 4.7 range (using .060 over bore pistons instead of .030 I assume) and a hotter cam.

Any plans to beef the transmission up?
Plans, not yet. I will wait until it poops out...I had it revuilt a few years ago with HD clutches...it should only have about 40K on rebuilt, if that...id have to check receipt to track mileage....

I though about the V8 option a few years back before I went to 6"...I had found a V8 with a bad motor for like $1000 and some after market lift part i coulda parted to recoup some cash...

I woulda spend more money getting a rebuilt 4.7L and swapping evrything over than what i think I will spend here....plus, i didnt wanna swap lifts, at the time....


I think the 4.6L stroker HP/TQ numbers will be the same if not better than the stock 4.7L...drawback is the tranny....

oh well...this is what I have, I gotta work with it...
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Unread 12-15-2012, 12:13 AM   #10
Bama_WJ
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Quote:
Originally Posted by PhantomWJ View Post
oh well...this is what I have, I gotta work with it...
Yea, that's basically my thinking now. It would probably take me forever to sell off my WJ to someone (normal non-Jeep people would think it's beat to hell) in order to buy a V8 WJ. On the other hand, I could build a stroker motor for under $4k.

Look forward to your build.
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Unread 12-15-2012, 08:58 AM   #11
PhantomWJ
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You can buy one way under 4K....

You can build one way way way under 4k...i buddy of mine just rebuilt his 4.0 wiht only a .030" overbore had he been patient he coulda added the AMC 258 crank and rods and woulda made out with a 4.7...of course at point, if he did have the crank and rods I woulda encouraged him to only go .020" overbore....

nonetheles, less that 1K was spent on parts and laber....he saved money by reassembling the long block himself, installing and unistalling....etc..

You can do it.
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Unread 12-30-2012, 10:42 AM   #12
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Yes your numbers are correct on the cost, of corse I took out my motor my self with help from an buddy
an handed my Mech my motor . And I got out of the shop for 1425, total cost, all including machining, 258 12 counter weight
crank, 258 rods, Sealed Power H825CP20 Pistons Hypereutectic pistons 20 over, new stock cam , oil pump, cam timing set,
I ported my head my self an saved big buck's on that . So really'' you can rebuild your 4.0 pretty darn cheap .
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Unread 12-30-2012, 10:57 PM   #13
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Hey I posted this yesterday . But I found it in the Grand Cherokee General Discussion thread site .
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2000 WJ 4.0 NEW 4.6 stroker. W/ 4'' Tera Flex Long arm kit, KING 2.5s w/res front,2.5 Kings w/res Rear,Tom wood front drive, 33 x 15s KM2s, Bassett 15'x8 ,fully addjustible Tera flex Track bar, IRO 3link rear, EBC Dippled & sloted front disks, EBC green stuff pads, Iceland off road fender flairs''.
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Unread 03-23-2013, 01:08 PM   #14
PhantomWJ
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So im picking this up today for two bills.

Head is new, less than six months old.

The WJ was the owners wife and when he heard a little pistons slap he decided to get it pulled out and replaced immediately; better safe than sorry he said. The oil pan was off and there was no sign of any piston skirt breakage nor did the bore look worn/chewed or damage. Plus, if there was some sarring the overbore would more than likely take care of it

If so, this will be my donor long block to begin the stroker build. Good thing is, if i have a block to work with, i will have double of everything...and of cOurse i wont have to pull my blo k and lose the wj for weeks....
3kb3j83n55ic5o35eed3lc6be6e28ccea1f5c.jpeg  
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Unread 03-24-2013, 01:57 PM   #15
PhantomWJ
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Does any one know the diferrence, aside form what is listed, between the Sealed Power and the Speed Pro pistons?

I can t find the Sealed Power but Summit has the Speed Pro, both in .020 over bore.
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