Yep, you can start sprouting drips and leaks all over the place if the normal pressure build-up in your system is not being released properly. I dealt with this myself recently on my rebuild. Forgot to vent the overflow canister properly. A 'too-high' pressure radiator cap would do it also as you mentioned.
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Chris Robinson
1969 Camaro SS/RS, 489 ZL-1 MPFI, T-56 Mag
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