Think I know but don't know y

[moses]

I never did figure out what caused the low vacuum. I looked for a leak and could not find one. It drove normal as hell thru out the whole rpm. I lined it up right and put a timing light to it so I had it the best I could. I didn't recirculate the bov because I was going map after I installed the aem ems.

My conclusion is the valve was not installed right and when I hit 15 lbs of boost it just got loose and fell out the next day. And the headgasket thing didn't effect anything. It probably would have blew later. I don't really know.