i have heard that the pushrod 4.0 v-6 was jus a bored and stroked version of the 2.8, with probably different heads etc., but my question is, i have a 2.8 and desire more power, and it wont be long till rebuild time gets here, and i was wanderin if i could fit the old style 4.0 crank into the 2.8, and install the longer piston rods with it, bearings etc. but i also planned on jus borin it around 20 or 30 over as long as it would clear the scratches in the cylinder if there is ne, so i wondered if i could put some 20 or 30 over pistons on the 4.0 rods, i was jus wanderin if that would work to make it a stroker motor, ive never tore my engine apart to know,and i figure id' have to get the bigger heads, and that'd be alotta work probably too. it's prolly a far fetched question, but if ne one could answer this for me, let me know thanks u guys!

 

Well, despite being related, the 2.hate, 2.9, and 4.0L share almost ZERO common parts, if they indeed share any at all. You can think of the 4.0L as a bored and stroked 2.hate, but you can not take that literally, since that is NOT truly the case.

If you really want a power upgrade, swap to an actual 4.0L (you must keep the EFI) or if you want to stay carbed, do a 5.0L swap.

As was put in another forum, "These are not SBCs we are dealing with here"

 

In a stroker engine, the rods are shorter and the throw on the crank is longer to get the extra displacement. One factor you need to think about is if the crank is going to hit the side of the block.

I imagine it could be done, but it's not going to be cheap. You're going to need to do a lot of measuring and lots of machine work. Start looking for the specifications of the parts and see what you're dealing with. I would be greatly suprised if everything just fit. The duability or life of the motor would be questioned. It would be a neat project though!

IMO - Like what was stated - Cheaper for 302 or 4.0L. Or even the roller lifter 5.0L H.O. You could essentially swap the cam, computer, injectors and a few other parts and do a Cobra kit conversion for a lot cheaper than buying the actual kit. My friend was able to pick up a 5.0L H.O. + AOD and wiring harness for $400 from a 93' Thunder Chicken. We basically drove the car home, ripped everything out, filled it with bad junk parts and sent it back to the junk yard.

Pete

 

the 2.9 crank can be installed in the 2.8 block for a slight stroke increase. you need to turn the snout down to fit the 2.8 timing gear and balancer though. the cost isnt going to be worth the extra power you will get, as the change isnt going to be much powerwise. better would be to swap the 2.8 out for a 4.0.

and by the way, the 4.0 block is taller than the 2.8 to accomodate the longer stroke. the 4.0 has other differences as well, they do share the bellhousing bolt pattern though.

 

I don't know what the deck height of various versions of the 60-degree V6 are, but consider this: A 4.0L crank plus 2.9 rods plus Mopar 3.3L V6 pistons gives almost exactly the same total compression height as a stock 2.9 setip and yields approx. 211ci/3.5L. Practical? Maybe, if you consider that a stroker 2.9 wouldn't require rewiring with a new computer and buying the 4.0 intake. As far as machining the snout, a lot of machine shops don't charge very much if it's done at the same time the journals are turned.

I would appreciate if someone could give me the center-to-center lengths of the 60-degree V6 rods and block deck heights of the different engines.

 

thanks u guys for sendin some answers my way, i jus wanna make a beast outta my 2.8 and that way, the truck is kinda stock lookin, cause it looks like a brand new 83 model. but ya'll i appreciate, and thanks for the tips! God Bless!

 

measurements I don't know the measurements but a company by the name of Burton Engineering would. Find them at burtonpower.com

 

Revisiting this thread...

Specialised Engines LTD in England offers 3.0 and 3.1 stroker kits, I didn't find any info on stroker kits @ Burtonpower.com. I have been kind of brainstorming this as well as stroking a 2.9. I found some info on the Burton site about using a 2.9 crank in a 2.8, but you would have to use different rods (2.9 perhaps) and 2.9 or other pistons for it to work - can't remember if it was the Burton site or another that said using the 2.8/2.9 parts would still bring the piston (up to) 1.5mm above the block's deck. I did find this and a couple of other threads here fairly informative in my quest, though