I freshened up my '62 413 a few years ago replacing rings and bearings on the previously rebuilt bottom end and changed cam from .557 MP solid to Lunati Voodoo Hyd. Stock heads received valve job, Lunati double springs and retainers and Crane teflon positive seals. When installing intake, was not able to install intake bolts with the felpro gasket/ valleypan/gasket sandwich, so cut my own thinner gaskets from gasket paper. Car is a summer cruiser and has probably done 1000 miles since. I have long suspected it was using a bit of oil, but hard to prove as it is driven so little. It blows oil smoke from exhaust on start up so I suspected something top end. I pulled plugs, 6 looked perfect, 2 were caked with oil residue. Pulled intake, looked into intake port of the 2 oily cylinders and the 1 that had the intake valve closed was holding back a pool of oil (see pic). When I saw the oil pool on the valve, my money was on bad valve seals, heads are cracked or I'm sucking oil from intake gasket. I dropped heads back at shop that rebuilt them for inspection. They crack tested heads and checked valve guides/seals and say they are perfect. That leaves that intake gasket seal. Is it really possible that a leaky intake gasket can lead to a teaspoon of oil pooling on an intake valve after shut off?