I'm attempting to make an adapter plate to mount a 2.8l chevy vortec/atlas to my series 2a transmission. This is my first time ever doing anything like this without a "kit" so I'm trying to learn as I go. Feel free to point out all the ways I'm blowing it if you want. I'm aware that this engine might very well break my series transmission, but I want to give it a shot. I'm trying to make something similar to a Scotty's adapter for this engine. I've milled down the chevy bellhousing and a series flywheel cover and got them to the combined thickness to have the series clutch release mechanism work properly with the chevy pressure plate and now I'm on to the issue of getting everything centered.
Here's a pic from a bit ago to show the rough basics of the adapter:
I've now bolted the portion of the chevy bell housing to the engine and I've bolted a series 2a 4cyl bell housing to the portion of the series flywheel cover and I've got the thing all clamped together. Using a dial indicator on a magnetic base on the flywheel I'm getting everything centered and I have a goal of being within .005" of center. When I stopped for today I was out by .017" so I'm close. A little more filing and I'll be there.
I'm concerned about the lack of precision fit between the series bell housing and flywheel cover. It seems like the centering will be thrown off when bolting up the series bell housing to my adapter plate. The series bell housing is cast aluminum and the mating surface isn't machined. I'm going to make a bushing out of bronze (like with a Scotty adapter and the stock series set up) that will live in the center of the flywheel to hold the end of the transmission shaft in place, but I really want things lined up properly so this new set up has a chance to last without eating parts up from misalignment.
Am I incorrect on the precision of the series bell housing and flywheel cover? Do Scotty's adapters address this somehow that I'm missing? Any input appreciated as I want to get this centered properly before I weld the two parts of the adapter together.
ps- I'm also doing a SOA and adding power steering and hydroboost brakes while I'm at it.