[gbmidyear66]

Thanks for the questions and suggestion Jerry, Lee.

OK - The last 2 times I attached the gaskets to the Plenum using contact cement - maybe that was not such a good idea.

The plenum seems to have good planarity (see pic), I can't get a sheet of paper under the level. The IH are not quite as planar, I can get a sheet of paper under - but just (see pic).

Something I did notice is that my plenum overhangs my IH on BOTH sides by about 1/32 - so I loose a little bit of gasket mating surface. I guess the IH has some play when it is attached - I didn't pay attention to this when I re-installed them after porting.

Ran the car up to temp (it now idles nicely again at about 700) - let it cool and re-torqued. I'll re-check torque after I put some miles on.

Hope this is the end of my aggravation with this....

Glenn