Yeah, Granted the tin has to be good to reuse. They're bad enough new. I've reused them before on other Fords. It's all in how well it comes apart. I know reusing the tin is ugly nasty business, but I'm in a bind, and I know it can be done. I can afford to spend all day massaging the tin to save $60. I used to put about three layers of Gaska-cinch on them around the ports and then RTV the ends of the valley and assemble it very carefully and say a little prayer. BUT, that's with a gasser and manifold Vacuum, not Diesel and Pressure. Without the previous advice I was leaning toward Hylomar. When I used to build Air Cooled engines I used Gaska-cinch for the case halves but then discovered Yama-bond, the stuff the Yamaha Service Wrenches use. I think it was Hylomar. It worked great but was hell to disassemble. I haven't tried spray Hylomar or Grey RTV but I do use the Aviation Permatex on bolts that see fluids like SBC Head bolts or IDI Flywheel bolts. I tend to be very gun shy with RTV as I've seen so much of it getting loose inside an engine and winding up in all the wrong places, like pick-up screens and oil coolers and the like. I like the stuff but tend to use it where nothing else will quite do. So thanks alot guys... I appreciate your help.
