chuck45

There is nobody in the aftermarket business dumb enough to waste money on a ludicrous money losing project like that. Especially in todays economy. There is no wall thickness to allow a bore increase. Do you actually think stroking it out to 4.1 or 4.2L (the same percentage as stoking a 350 SBC to 383) will make any real world difference? For probably about the same cost you could add a blower (not that I'm a fan of them but it would be easier and more practical than stroking) or put the money towards a V8.

Rock Krawler Suspension

While you guys are on this subject. Has anyone tried the 4.0 parts in the Nitro? We are not sure, but we think that is the same family of engines. Someone try it and let us know! Please.........

Rock Krawler

RedneckJeep

A competitent machine shop could stroke the stock crank probably farther than you think just with offset grinding. There's your crank. United Engine who makes the Keith Black piston line will make you any piston you want. All you gotta do is call. There's the pistons. I'm sure the stock rods are plenty strong enough. So there's your rods. Sonic checking the block will reveal how much of an overbore it will handle......probably not much. I would think .060 or .080 at the absolute max. Somebody get busy.

The cubic inch formula is as follows:

Bore X Bore X Stroke X .785 X number of cylinders.

The stock bore and stroke in inches is 3.78" for the bore and 3.43" for the stroke. Lets "assume" we can go .080" over with the block. Lets also assume we can get .125" extra stroke from the stock crank.....which is entirely possible for a GOOD machine shop. Lets see what we come up with.

We add the .080" to the stock bore and get. 3.86". We add the .125" (1/8") to the crank stroke and get 3.56.

So bore X bore (3.86 X 3.86) = 14.8996. Then, 14.8996 X a stroke of 3.56 = 53.042576. Then we take our given figure in the forumla (.785) and multiply that by 53.042576 to get 41.638422. Finally we multiply that figure by 6 (the number of cylinders to find we now hava a 249.83053 or a 250 cube V6. All that just to add twenty cubes. I suppose though, twenty cubes would cut lots of grass, wouldn't it?

JackMac4

SLeepY_BoY

i owuld love to see someone make the stroker kit already... i need more boost, i wish i could get 1bar boost with the minivan engine

Atl JK

Totally different engine family.

SLeepY_BoY

that sux..... forged internals would be nice though

RedneckJeep

They're really not necessary on a street or off road engine. A cast crank on a Chevy 350 can stand 500 HP. What's important is getting a really good balance job and running a quality balancer. I had a stock bore and stroke 360 Chrysler engine in a '65 Plymouth drag car that routinely saw 7800 RPM for four straight seasons and was my daily driver usually three days a week. The rods are forged anyway. As I said in my earlier post, United Engine will make whatever piston you want. Forged, cast or hyperutectic. I would prefer forged. They are a little louder cause they need more room to flop around, but they sure do stand up to some punishment.

mbanik

I think the cheapest motor upgrade will end up being one of these...
http://www.allpar.com/mopar/phoenix-engines.html

Wait till they put them in the Wrangler then wait till one shows up in the local wrecking yard.

RedneckJeep

Probably about right......BUT I bet for around the same amount a HEMI could be had.