Difference in 3.8 Blocks?

[sheckyZ28]

How could I convert an '85 basic regal 3.8 block, that has the 14 bolt style oil pan, to a 86-87 style block? What would be involved?

 

[Nick Micale]

All you really need to add is a drain-back hole for the turbo which can be close to where it is on '86-7 blocks, or in the oil pan. If in the pan, no mod is required to the block. Of course you would use the '85 timing cover too.