David you are right about me being above sea level. I didn't even think about that. The rings being worn is out due to this being a fresh rebuild. I also had to put another head on the motor due to one of the exaust mani studs being broke and at that time I removed and replaced steel head gaskets. That combined with it having a stock ground cam the vacuum numbers should be higher wouldn't you say? With all factored in 15 hg should be about normal?
I also had to put another head on the motor due to one of the exaust mani studs being broke
I have heard of those tabs breaking, so the correct fix is to replace the whole head? Can the tab be welded back? I agree it should be fixed, it would be bad to just slap it back together and wonder why you can't get the exaust leak to go away.
Gary I can't remember the exact cost to have the head shop swap the guts out of the head that had good valves and such into another head and check it out , but seeing as how I didn't have the piece of the tab that broke in my possesion nor did Nick the options on how to fix it were limited anyway. I am sure if one was so inclined it could be brazed or welded back on, but if you are going to have to pull the head to have it fixed or fix it anyway having the head shop swap guts or check out and work another head should be about as cost effective.
It sucks not to be able use a head because of that tab but it does make sense, especially since the tab is MIA. I think you should have just tricked Nick by slapping a nut and bolt on the manifold. Just kidding Nick.
This is quite the situation. On my 392 in my 100, someone in its past life welded the tab on (pass rear), and although they did a good job, the break is into the exhasut port. It doesnt seal right. I have to replace the manifold gasket about once a year, using header gaskets. Eventually I will just replace the head and be done with it.
Hope yours is better than mine, Ted sounds like his is OK.