I'm working on rebuilding a 270 GMC and the seal surface on the crank is pretty pitted and has been already been ground undersize a little. I'm considering modifying the block to accept a rubber rear main seal.
I found a Garlock split seal that is a size that I can counterbore the back of the block to accept the seal. (see pics)
Boring out the block should be fairly easy. I can set the block on my mill sitting on the top deck and be able to bore it using a right angel head on the machine. The installation instructions call for a seal retainer to be installed which I can make and retain with some small flat head screws. With the one-piece design of the split seal it will require me to put the seal on the crank before setting it in the block but I think that will work ok.
Basically I was wanting to bounce the idea off folks in this forum to get your reaction to the idea. Do you consider it a workable idea or would you say no way?
