Red, Do you have the proper radiator cap that will maintain the correct pressure for your cooling system? Are your hoses all good? (Sometimes they will look good on the outside, then be bad inside) And last, do you know for sure your temp gauge is correct? My '65 Chevy Pickup with a 230 began "running hot" all of a sudden. I had the proper radiator cap and the radiator was not boiling over. That truck never had a shroud. I checked everything above and found that the temp sending unit had gone bad. It actually was NOT running hot.
