[wl_walker]

I've used positive seals before, two things I had to do first: install self-lubricating guides an to machine the boss so that they can fit. I haven't taken the springs off yet, need to see what's going on in there. I have both positive seal and umbrellas with O-rings on hand so I'm ready either way. If this doesn't work, and depending on what I get out of the leak-down test, will determine next steps which will be to pull the heads and have my local machine shop look them over as well as see what if anything is going on with the head gaskets.