GMC-IS-Me, I have a question about your drilling and tapping your crank to flywheel. I am repowering my 1937 Chevy 1/2 ton truck and the 216 engine specs on engine show that is has a 4 bolt pattern ( 1937 216)to the flywheel and the donner engine is a 1956 235 with a 6 bolt crank shaft bolt pattern. In order to use the original 3 speed - torque tube differential I need to use the 216 flywheel and bellhousing. Can you explain the pain - process you went through to drill yours? in my case I would be drilling the flywheel for four bolts.
Thanks
RonG
