Hello:
Thanks for the replies...Perhaps I wasn't clear enough on the Proforms....I had them in long enough to break a couple of adjuster studs. Luckly nothing serious got hurt. Now here are some photos comparing the CATS (brown one) to 440 Source (Silver one). It is pretty obvious that the 440 Source is much larger, both have double row of bearings. The Cat has a washer type of stop (for want of a better term) on the roller contacting the valve. I havent put this on a head with valves in to see how it clears the retainer. The Cat has a Hex lock nut while the 440 Source has a 12 point nut.
Just thought some of you might like to see them compared.
Maynard