318 - intake vacuum leaking
I think you have multiple issues
#1, I doubt yur gonna get away with that much cylinder pressure for long.
#2, I have seen those big-port gaskets not seal on the lower edge, on the backside. I would not use them, unless I was sure there was meat enough on the head.
#3, if you really took off .100, then the bolt holes should not line up in the intake attaching windows. When you pull the intake down, there is no way of telling when your tightness is because the gasket is crunching or if the bolt is jamming in the holes.
#4, if oil is sitting on the intake valves, you got a problem! Don't just bolt this back together until you fix it. 100 miles per quart is a ridiculous amount of oil to be losing.
#5, you said
Has anyone had an intake vacuum leak (oil being sucked thru ports from poor sealing) due to shaved heads?
The assumption is that this is happening to you. Did you actually put a vacuum gauge on the CC and see it, or were you assuming things? If you measured it, then you gotta fix it, not bolt it together and hope for the best.
#6, with 175psi cylinder pressure, and no Quench because the pistons are .057 down in the holes (or more); How are you planning to deal with the inevitable detonation? Are you running a big cam with a very late closing intake valve?
#7
and 5 good cylinders are like 175-177psi.
The 3 burnt oil spark plug cylinders were 150-155psi.
This is a problem; you may already have detonation damage in those low-pressure holes; I would do a LeakDown test before going any further.
#8, IMO, before this is over, it wouldda been better to install the proper pistons.And I think yur gonna end up there, sooner or later. But I'm still gonna wish you luck.
Happy HotRodding
