If you do have/find a leak on the intake runners, I would suggest rather get the proper gaskets - sure you could use a liquid sealer but the actual gaskets have a way better chance of permanently sealing the flanges because of the bulk of the material.............. also note that any air leak on the valve cover will/could also cause a intake air leak via the PCV system.Question. I recall the intake manifold had three inset rubber gaskets around each intake hole and at a quick glance, my normal spares place do not appear to stock these. Could I put a secondary bead of red gasket sealer near the outer edge of the actual gasket if I do pick up a leak? I have a tube of the stuff I used on the valve cover.
Just so its asked - do you have a proper dipstick present in the sump? ............any other vacuum hoses to do with emissions all connected? ................brake booster working and vacuum pipe to THAT connected and not cracked or leaking?