98 Durango --- 318 to a 360

External dimensions are exactly the same. The recipricating assembly, and balance is differant. So you need the short block, balancer, and flex plate to match the 360.

While the engine will fit, there are some differences. The two most important ones are the computer and the fact that the 360 is externally balanced while the 318 is internally balanced. The fuel curves are different for the 360 and the 318 computer may not give you satisfactory performance and I'm not sure about the legal situation of swapping the computer from a different vehicle. As for the balancing, IIRC you will need a torque converter balanced for the 360.

I am betting you will find what you need here.

Thank you all for your input... I'll have to let you guys know how it ends up. Looks like I will go with the 360 5.9L Long Block, no real need for the performance mods. I just want more power to tow a trailer, especially when travelling uphills.

My 318 has about 200k miles on it and the rear seal is starting to leak so it needs to be pulled anyways, hence the question of upgrading to the

Thanks

Hi, I have successfully done this. You have a couple of concerns. The 360 is externally balanced, so the flex plate will have to have to have the bob weight. In the case of a manual gear, you will need to use a 360 flywheel or mill the corresponding volume of iron off the opposite side of the flywheel that the bob weight is on the flexplate. I did this and it just worked. Depending on the year, you may have to drill and tap a 3/8 NPT thread in the top of the inlet manifold to accomodate a thermal sensor. You may use the