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1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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That IS your cap. It's another difference from "normal" cooling systems to the LT1 cooling system. That tank is not just a overflow tank, it is pressurized along with the rest of the cooling system. If you look, the cap should have a pressure rating on it, like a normal radiator cap. Also, make sure that none of it leaks into your Opti-Spark, which is below your waterpump.
 
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