Couldn't find any threads on the pressures for the 12a's rad caps but what is suggested? 13psi is stock if I'm not mistaken but at some point I got a 21psi cap on mine?! I had a bridgeport in not long ago so not sure if it happened then or if that would make sense for a bridge but I'm back to a stock port now. I had to bypass the heater core due to leaking into the passenger floor but now I'm feeling real dumb cause this very well could be the cause right? Thanks guys!