High all. I have the 250 head and was wondering what the thread size is for the vacuum fitting that sits behind the carb pad. I have a fitting in there but it won't seal up, even with teflon tape. Its giving me fits so any inf will be greatly appreciated. Thanks, Ron.
Thanks for the reply Bubba. The one I'm using is a 3/8 NPT and I dont get it. I tried some thread grease from ACE and that didnt work, didnt think it would. The aluminum threads cut the heck out of the pipe tape and you can't find adapters/fittings anywhere anymore.
Every so often you will find a fitting that fits a bit loose because they cut the threads a little too deep you could try another one. You can also use some of the Permatex gasket sealer in hardening type if its real loose or the non hardening type if it's at least snug, or some of the Teflon pipe dope that is used for water and gas pipe. Good luck
Will do. I forsee a long weekend ahead. The thing snugs up just fine just wont seal. Its actually made up of three fittings so I'll try a plug first then add pieces in as I go, maybe the brass cracked on the main piece. MTF
If you still have good hearing you can use some small rubber Vacuume hose 1/4 to 3/8 inch and listen at the different places along the carb base and intake manifold. And you can also use smoke (about the cleanest way), spray carb cleaner, and a half dozen other ways too to find those Vacuume leaks. Best of luck
Bubba, sorry I didnt hit you back with a follow up. Yes the threads on the fitting I had were cheesed so I bought one from Lowes and voila! Tighenet right up. As you know its still not running "right". I'll be chasing a vacuum leak tonight.
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