Here is what I'm working with.
1948 chevy fleetline
stock radiator with 3core
1958 Chevy 235
I started off using a zero lb radiator cap. Water was leaking out of the overflow. I switched to a 4lb cap, now water leaks out occassionaly through the the overflow tube. What is the highest pound cap I can use without damaging the raditor or blowing a head gasket? Would a 13lb cap be safe?
I live in Sacramento, Ca. so it's usually warm weather.
