Joey you might want to take a picture of the firewall,it was mod for the hose on the back of the bluehead. The plumbing on a greyhead is a little different. IThe bluehead can be installed without changing the firewall, but you have to chang the pluming and the hoses will run too close to the exhaust manifold.
what Chris said. If you take that little screw out it can be a real pain to git back in before all the oil in the reservoir runs out on the floor.Then you wonder did I just introduce an air bubble in the system.
sometimes I have to burp my cooling system after draining it. You get a bubble that just won't come out.Take the radiator cap off and lift the tail as high as you can. might help or not, but it doesn't cost any thing.
Man, you're right on time! After 20 years of running gas through my old fiberglass tank it started leaking about a month ago. I've been researching everything there is to find about fixing and replacing and was just about to start to cut my tank open when I came across this post. Needless to say, I'm very interested. If you're going to put price and pictures on here that's fine. If not, I'll email you.
Hey Joey , did you get my PM?. I still have the copy of the Sept 1992 Sport Pilot magazine I"ll send you. It's got the Avid Mark IV on the front. The article is by John Conrad. Maybe you could put that article on here too. I'm not sure how to do it. Let me know how to get it to you, if you'd like it.