Assuming the engine and tranny have the same spline count what would go into creating an adapter plate? Is it as simple as making a plate to make everything bolt together?
Assuming the engine and tranny have the same spline count what would go into creating an adapter plate? Is it as simple as making a plate to make everything bolt together?
What do you mean engine and tranny have the same spline count?? You mean the clutch disc that goes to that engine?
Is this a hypothetical discussion or do you have a specific engine/trans in mind?
Spline count is the least of your worries, odds are you can find a disc that will work in the engine's pressure plate. Things like the input shaft being long enough to go into the pilot bearing (possibly getting into flywheel spacers) and the starter mounting are bigger issues. This is high precision work, I'm not sure what permissible misalignment is, but 0.000" is ideal. If the trans has a removable bell housing, it can be just as easy, or easier to make your own bell, or an adapter between the trans and bell (e.g. you used to be able to buy a plate to put a Ford Toploader 4 speed behind a Chevy bell housing).
example of building a custom bell: https://grassrootsmotorsports.com/forum/grm/homemade-bellhousing-project/31440/page1/
Im looking into mating an L28 engine with a Z32 transmission.
This gives you a good idea of whats required:
Alignment is important, but as long as you can get within 1/8 of an inch of center or so your good. They make offset dowel pins specifically fix trans to motor alignment.
I'm about to try making an adapter after my clutch and flywheel get here, I'll let you know if I blow something up. 
Good point, I'll still let you guys know when/if I blow up my motor and/or trans. 
In reply to Slippery:
Thats the kit that gave me the idea. Ive emailed him several times but havent gotten a response. Hence my question about making my own.
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