Yes, but it's not rubber. It's the same material the 1pc SBC oil pan gasket is made of, so it won't harden, and blow out. It's embedded inside the plastic/fiberglass body the gasket is made of, and looks more like a raised edge than a round O-ring, so when it flattens out after being tightened it will seal flatter than a standard O-ring.
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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