the cap is a 16 pound, i think they test the system up to 18? not really too sure. for $3.99, go get a new one and see if it helps. Mine was bad, wouldn't let coolant into the overflow bottle, I had some wierd things going on, the hoses were under full pressure (hard), overflow bottle wouldn't take or add coolant, etc. Just get a new cap if you are unsure. I picked one up before a flush and fill the other day, and it is a Stant, says vented on it, but was spec'd for the 302 v8.
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