440Source Solid Roller Lifters

For what it's worth the T&D rockers on Matt Hartford's Pro Stock engine in the video below has needle bearings in it.

Now the valve springs they run are 550# on the seat and probably around 1600# open pressure.

I've had a set of Comp Cams 829's in my 499" RB for 10 years and while I do inspect them every few years I've never had an issue with them.

The next set I plan to buy will be Isky, and only because I have a friend that has a sponsorship deal with them.

Personally, I wouldn't use a set of 440 Source lifters because it's just not worth taking a chance on them.

Just remember: The bitterness of poor quality linger on long after the joy of a low price.

Tom