Addresses for the adapter plate
I started with a piece of ½ inch aluminum 10 inches by 11 inches.
I then bored a hole 4.905 inches in diameter 3 and ¼ inches down from the top and centered on the 11 inch width. This is not that important because later you will trim the excess material away making a nice looking adaptor

The 4 holes have been located. YOU only need 3. Leave the upper right one out. This adapter Doug and I are making is for something else so we needed 4 holes
Anyone with a mill centers on the large hole, calls it’s address 00 and goes from there. This is inches

Remember you make it look pretty later. Leave the upper right hole out.
This is Doug/Carguy4sure centering the hole to begin drilling at the address he early found from the bellhousing.
https://www.corvetteforum.com/techti....php?TopicID=3
https://www.corvetteforum.com/techti....php?TopicID=3
I ran this exact swap for a year behind my blown bigblock and if you don't power shift you won't hurt the tranny.
Gotta love having a full digital readout on your bridgeport 
I just would have problems with headers, could machine that area out. I also don't want the motor that rigidly mounted.
Yes digital readout is great, cost about $1000 to $1500 per readout though.
I can generate a computer program with all addresses for drilling wheels. It makes a dividing head obsolete.
Example. If I want to redrill a new bolt pattern in a set of wheels I just ask the computer for 5 holes, 4 3/4 inch bolt circle and it spits out the addresses of the 5 holes. The center or big holes address is always 00. I find the center of this hole, punch 00 as it's address and go to the other 5 and drill. Nothing to it.
Thanks for the pictures and technical information. I will see if our shop can duplicate this tomorrow.
Bernie


Thanks for the photos and the co-ordinates for the holes.
I checked thru your previous posts and came up with these,
http://forums.corvetteforum.com/show....php?t=1177850
"question for the T5 experts"
http://forums.corvetteforum.com/show....php?t=1176281
"Tremec for mustang"
Any other threads you'd suggest for reading/info so I can correctly build one for myself?
Also, I read that you went with a hydraulic clutch set up. Will this adapter plate set up work with my current stock assembly in my '77?
Thanks for the info
Jeff
The Best of Corvette for Corvette Enthusiasts
Thanks for the photos and the co-ordinates for the holes.
I checked thru your previous posts and came up with these,
http://forums.corvetteforum.com/show....php?t=1177850
"question for the T5 experts"
http://forums.corvetteforum.com/show....php?t=1176281
"Tremec for mustang"
Any other threads you'd suggest for reading/info so I can correctly build one for myself?
Also, I read that you went with a hydraulic clutch set up. Will this adapter plate set up work with my current stock assembly in my '77?
Thanks for the info
JeffSo far all we have is the plate with the large 4.905 hole and drill the other 3 holes on those addresses and leave the top right hole out.
I always square the plate on the mill so the top of the plate is flush with the edge of the table. This just keeps everything square for now.
As for the hydraulic clutch setup it operates the clutch, the adaptor plate does nothing for the location of the clutch, the fork and the release bearing. All that is in f
If you look at my post on the hydraulic clutch you see even the firewall has a raise section where the master cylinder goes. Doug couldn't find one on the outside but from under the dash the hole was there in the metal plate lining the inside of the firewall.







