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Carb gasket disintegrated - weird !!

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My '66 (200 Engine, 3 speed, autolite 1100 carb) has been running flawlessly for years. Just recently, starting running like SH*T. Very bad idle, stalling and rough running at low rpm. At high RPM, all was pretty good. So I figured maybe a vacuum leak.

I removed the carburetor and voila !! This is the spacer to intake manifold gasket - it is total disintegrated (top photo) - almost non existent. I know gaskets can wear out but I've never seen this before.

I had to use a razor blade to scrap off the remains, clean up the surface, and then laid a new gasket on the surface (bottom photo). Car runs like new again. Interestingly, this happened only to the gasket between the spacer and intake manifold and NOT the carb to spacer gasket. I wonder if this is from the ethanol in gas nowadays and if so, I wonder if any gas station sells gas without ethanol?

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· Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
23,541 Posts
I've seen that before. There exists gasket grades known as "rebuilder grade". Many are/were little more than cardboard. Many years ago I knew a guy at a high volume engine rebuilding company. A buddy needed some head gaskets and the guy hooked us up with an entire engine rebuild gasket kit for less than what a single head gasket would have cost my buddy. We used the head gaskets and they worked fine but the rest of the gaskets were of obvious laughably low quality and we threw them away. They were that same white fiber looking stuff as what remains of that old gasket. The gray FelPro-looking one you have put on should last you just fine.
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