WTB: Used 4.0 for a 4.6 Stroker Build

[JaVeLiN]

Anybody have a spare 4.0 engine for sale?

1.) Looking for a 1991 to 1998 engine, and a used short block is fine, but a cylinder head would be a plus.

2.) Would also like to have a RENIX 4.0 block. (1987 to 1990, i think...)

3.) Last item, anyone have a crankshaft from a 4.2L Jeep or AMC 258 CID?

Thank you,
Roy :us:

 

[NorCalChris]

I have a head or two laying around, I can port them for ya too. You also can buy a NEW head for just a little more then having a used head rebuilt and gone through. You are going to need a lot more parts then just that for a stroker. Whats your plan for it? I can help you through it. There is reasonable way to do it, and there is expensive ways to do it, it all just comes down too how much you want to spend.

 

[JaVeLiN]

Chris, the plan is to make a low-buck 4.6 stroker with a 4.2 crankshaft that runs higher compression and 91 octane pump fuel. (or perhaps e-85 since it is 108 octane) Stock 4.0 rods, new KB pistons, and a ported head for sure. My '95 XJ just needs more torque, and since the stock 4.0 has 214,000 miles on it, I figure getting a spare engine together would be smart. I have a good set of 24 pound injectors saved up, and hear those work well on a 4.6 stroker. Also want to deck the block back to zero & run the largest cam that will still pass smog-check in Sacramento County. The idea of a new head is pretty cool, and if you could share a link for that, I would appreciate the assist. Thanks, Roy

 

[NorCalChris]

Ok, I see already have found Dino's web page. Let me ask some stuff. What are the specs on your rig? lift height, tire size, gears, transmission. what is wrong with your engine?

 

[Alboy97XJ]

I have a bottom end with a bad piston.... Block is good still from the looks if it.... But I'm in reno

 

[JaVeLiN]

Ok, I see already have found Dino's web page. Let me ask some stuff. What are the specs on your rig? lift height, tire size, gears, transmission. what is wrong with your engine?

I have a 3 inch lift and 32" tires with 3.55 gears and the 4 speed automatic. The engine runs great, and has 45 PSI of oil pressure when hot. The oil pressure was low, so I pulled the pan, put in the MOPAR HV oil-pump from Summit Racing, and +.001 rod bearings. I now have 55PSI cold, and 45 PSI hot. I did see one rather flat cam lobe on #1, and the stock timing chain has a bunch of slop in it. While I was at it, I installed a reman cylinder head with all new valves, new stock springs and bronze guides.

Here is the dealeo.... It wheels great, but out on Interstate 80, it needs more torque with the 3.55 gears and 32" mudders. Sure I could spend for 4.88 gears and a new Detroit locker front and rear, but the last time I did that on a 4x4, it was over $2000.00 !!! Seems like I can make more power with the 4.6 Stroker, and all I am really missing is a set of KB Pistons, a good 4.2 crankshaft, and a new Cloyes Tru-Roller spinning a Mopar Purple Cam.

Do you think I am going down the wrong path???

Thanks for the help and guidance, Roy :cheers:

 

[JaVeLiN]

I have a bottom end with a bad piston.... Block is good still from the looks if it.... But I'm in reno

I get to Reno almost every Tuesday, so perhaps I can meet up with you and take a look. I could use the 4.0 block I have, but it would be handy to just build an entire spare engine with new pistons and a new head... If I was in Reno new Tuesday/Wed, how much cash would I need to bring to buy that 4.0 with a bad piston?

 

[NorCalChris]

I do think you are going down the wrong path. It's a good path, but not now. I'd say just gear to what ever you think is appropriate and call it good for now. You don't need lockers to gear it.

 

[JaVeLiN]

Sounds good to me. I will gear it first, and slowly work on getting the correct parts to build a 4.6 for a Christmas present for Jenny Jeep. Thank you.

 

[NorCalChris]

It is a lot easier to gear axles then it is to build an engine.