Hey Guys I posed this question to the Heating and Cooling Forum and got no love... What PSI Rad Cap are you guys running? I am not sure about mine as it is a 13lb and seems to blow off too easy? I have a 66 SS with a mild 454 30 over computer dyo says 520hp but whatever. Anyways, the cap seams to leak around the Rad fitting once in a while pissing all over the engine bay. The cap is somewhat new but I was wondering what .lb cap you guys run on you ride. I have an overflow hose but no catch can. Thanks for any info..