383 440 swap. Same flywheel?

Well folks, I’ve got the 383 and four speed out of the car.
This is what I’m planning to try. Won’t hurt to try.
I’ve “only” got 600 bucks in the cast crank 440 from the junkyard man, and I’m hopeful that this will work and keep it a bucks down swap.

What you are looking at now are pictures of the 383 with its flywheel and a rough mock up of a fixture to drill the 440-cast crank for the four speed input shaft.
The 440 has a hole started (see earlier pics) but just not deep enough.
I’ll swap the flywheel over to the 440 and use it for a perpendicular surface to try it and get things lined up.
Weld the pipe nipple on the angle iron. Maybe back it up and use the flywheel as a true surface.
In other words, it won’t be as far in as in the pictures.
Or maybe come up with something else for a “pilot”.
The four speed input shaft is ¾ and that’s the largest drill I’ve got on hand with a ½ step down shaft for a hand drill
But if I can get slightly larger bit, that would be better to accommodate errors and allow for a ¾ shaft size.
Ideally one of those magnetic base portable drill presses would work too.
But I don’t have one. And who knows what a rental store would have or cost.

Than maybe I’ll use a register bushing for the input shaft instead of a “pilot bushing” inside the crank.
There was some good info on the “pilot bushings” in the dodgecharger.com link, but I don’t know yet what size pilot my crankshaft may be drilled for.
Or if is.
Maybe it is drilled for a pilot bushing but not reamed, like they said.


If this works, I’ll get the flywheel balanced like people have said for the cast crank and I may be good to go.

Thoughts, pro or con?

(I hope to also sell a 69 383 sometime in the future. Looked up the numbers :-)