Ran into a issue today while swapping a big block in my 83 camaro. It went in just as easily as the small block did, however when I went to bolt the torque converter to the flex plate i found that the holes do not line up.The transmission is a 700r4 (out of a 93 caprice) any Ideas? Flex plate change or torque converter?


Oh I should probably add that the engine is out of a 90 chevy truck

 

elongate the holes. Or start measuring and shopping for new.

 

Thats what I am asking, shopping for what, just a flexplate or will I need a converter?

Just thought of something...The transmission that that was in the donor vehicle was a TH 400. Could the flex plates possibly be different between the three and the four speed transmissions

 

The stock flex plates are slightly different, but not enough to be much of a problem.

The difference is, the older trans bolt circle is some convenient even-number type of SAE measurement, and the newer one is some metric equivalent. Most aftermarket FPs are slotted to accomodate both. You can do the same to your stocker.

 

Ok that helps a lot. Probably a good Idea To get a SFI flexplate any way