I bought a CSF all metal radiator and the OEM radiator cap did not fit either! Mine was metal top so I used a hammer and reformed the top of the radiator. Now it fits very snug.ALnut said:1. i just got a CSF radiator off radiatorexpress. the plastic crap.. the install fits and all. but the old Cap doesn't fit the new radiator.. so i got one from autozone,the new cap fits but really tie, i have to force it.. should i keep that cap or order one that from CSF??.. the old cap has a spring in it. and the new one doesn't.. hope you guys understand my discription.. with or without the spring in the cap, can i still use it?
I suspect a manufacturing defect.