According to COMP, the ID of the spring is 0.795". I don't have the head apart at the moment so I can't measure the OD of the guide. They are the stock e-brock guides though.

The heads had the 928 springs put on them years ago. According to my records, the seals where not switched. Not many miles on the motor but I am getting oil into the cylinders, and it looks like it may be coming down the guide.

I had some MP seals in my garage, and mentioned to my brother that I could swap them in if the seals were gone. He pointed out that I need to be careful about the seal selection with the dual spring, and that set off a light bulb wondering about the original seals from e-brock.