I have a 64 Ddart slant six. It needs rebuilding so I bought a spare from a 72 Dart and tore it down to rebuild. Now I need to know if the 64 engine will bolt to a 904 or if the cranks are interchangeable between the two engines. If the 64 engine won't bolt to the 904, please tell me why and if there is a way to meke it all work.

Thanks

somebody will give you a better answer, but the early crankshaft (thru 67) is different that the (68 and after) crankshaft in that the flywheel bolt circle is different? or the pilot hole. But I think the crankshaft themselves are interchangable. The trans will bolt to either engine. But you will have to change your driveshaft if you use a 66 and later trans. Different type of connection to the trans.

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lol. At least you arent going the other way (early motor in a late car).

I dont remember the dimensions, but the crank pilot hole is smaller in the early engines. All you have to do is have a brass bushing made and drive it into the pilot hole. Go to a machine shop with micrometer measurements of the inside diameter of your crank pilot hole, the depth of the hole from where the taper ends, and the largest outside diameter of the torque converter pilot lug, there are two wide grooves cut in the shank of it as I remember. You want the shoulder reading. The machine shop should be able to machine a brass bushing for you, then drive it into the crank. Dont forget to specify a slight interference fit on the OD so it can be driven in and left there. Some will say the bushing isnt necessary but I feel it centers the converter and takes stress off of seals and bushings, and prevents shudder from centrifugal imbalance.

now if you were going the other way, you would have to remove the crank and mill it out OR have a custom torque converter made. You cant just mill the TC stub down because it is hollow and acts as a support bushing for the impeller. Another thing you could do is use a TC, input shaft and pump from an early 904 pushbutton. I dont think you have to go in any further than that, but I could be wrong. But as stated above, this is not a problem in your circumstance.

Another thing is, the mounts do not interchange, you will have to use the ones off your car. And the crank pulley is going to be smaller? Or larger. I forget. I had to change the belt to get my alternator to work on the early engine because it was fitted with a generator originally. You can also reuse your early pulley and reuse the belt.

I think that's it.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

The name of the item you need is called a yoist buishing and Doc has a thread on this subject on our site but not sure where or when. I put a built 360 in a 65 Cuda and have to have one made . Local machine did i think three for me for twenty dollars. I think Dale Rose has the other two . we did the engine swap at his shop. The deminisions are on the article about them. Thanks Ron Possum Parker







Drake n. Male duck scared of Possum and allergic to Bagel

This is a common issue, here is more info:
http://www.slantsix.org/forum/viewtopic ... or+bushing

DAMN, that's right, I knew I forgot something...

my motor was out of a polara, and the oilpan hit the center link so I had to replace it with the original '69 pan and tube.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

So, if I were to go with the newer trans. and the older engine, I would have to bore the crankshaft out to make the converter fit? Could I just use the the newer crank in the older motor? Would there be any problem with putting the newer motor's crank in the older motor as long as I replace the bearings?

Thanks for your help!

As long as both motors are 225 cid, you can swap the cranks. 64 had the 170 and 225 engines. Also make sure the later engine is not a 198. That is not likely, but you never know unless you check.

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Charrlie_S
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