I got the cap threw summit racing. It fit the radiator with no problems and looks pretty good too. My big concern is will it work ok for the LT1 cooling system? The stock cap says 18 LBS and the CSI is listed as 17 LBS. What do you guys think? Thanks James

 

I cant say if it'd work fine or not, but I personally wouldnt feel comfortable with in there. I just bought a Stant radiator cap for $4... 18lbs. Its a cheap enough part to get the correct one.