What are the some of the best 'retro-fit' hyd. roller lifters at present for Olds engines? I see some are $100+ more than others (ie. Lunati vs Comp Cams), some mention cast, others forged, short-travel, etc. Who makes them for Comp Cams?

 

I have comp cam's roller lifters in one 455 and Erson roller liters in another 455 and they are both fine. Not sure who make them for either but would suspect both are not made in house.