I'm rebuilding the engine in my 82 D150. I know I've heard of thin head gaskets but for the life of me I can't find that info now. I know a Felpro compressed is about .039 or so but I recall hearing of some that are .020. Who makes these?

Those were the OEM head gaskets. They have been discontinued for many years. Just have to post for parts wanted, and hope someone has one they don't need.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

You will occasionally find them on Ebay for anywhere $50 and up (usually 'up').
Factory P/N's 1947578 and 2843182

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-MattMan
LEANED & MEAN