..............Ron Davis on my 69 Camaro. I'm sure the units mentioned here can do a outstanding job on keeping engines and transmissions cool, as well as giving the drivers peace of mind . I did some research on all the radiators that have been mentioned here also. I have no regrets whatsoever in the decision to go with Ron Davis. It has kept my modified 1st gen small block at a consistant 180 degrres no matter the conditions. From downtown Chicago 100 degree day stop and go traffic or prolonged highway cruising speeds. I am sometimes concerned that my guage may be faulty for not moving from the 180 degree position!!!!!!!!!!The workmanship is like a work of art, outstanding materials and components also. No I did not get paid for this endorsment!