I bought my GMC radiator ( ME356 heavy duty 4 row )at Carters and have had no cooling problems with it and I have a 248 6cyl. in a 1 1/2 ton - did have some mounting issues but that most likely was just one of my trucks many querks . See 302-6cyl waterpump problem in the "engine and drive line"forum - was posted 6-21-08