You asked: Where'd I get silicone stovebolt gasket?

This is in NO way an endorsement or ad.
I have ZERO connection with this business, other than our shop used their aircraft gaskets...I asked A&P mechanic about them and asked you guys about gaskets...I just fly them...with success thus far.

Gasket arrived, promptly, $29.10.
Ordered Monday, arrived Thursday.

Looks professional quality and seems to fit contours of valve cover. Says to install DRY, NO lube. Reusable, soap washable.

I have not actually installed or leak checked. Not sure how to tack in place.

Real Gaskets Tennessee
2506 Stateline Road
Elizabethton, TN
(423) 543 6194

1937 TO 1962 Chevrolet STRAIGHT 6-CYL. 216, 235, 261 CID
Part # CVC-3

They included a sample piece of fiberglass reinforced silicone gasket. I'm thinking CJ5 differential covers and BSA valve covers next.

Expect I'll no longer be only one on Earth to try these, eh?