I have just recently done a custom install of a Griffin radiator in my FC. It has a domestic style cap (bigger) so a Mazda cap is out of the question. Right now I have a Stant Lev-r-vent cap at 13lbs. I have heard bad things about Stant's reliabilty and would like some input on a quality cap for my style of radiator. As for as pressure, I assume I will want to stay with the O.E. 13lbs, but most of the domestic caps I see are 16lbs, with the exception of a Mr. Gasket cap that had a thermostat made into it.

Ideas? comments?

 

Do they base those radiators off teh GM radiator caps? Im sure there are plenty of good aftermarket domestic upgrades