Quote:
Originally posted by ultraflo
They work just fine past 6000rpms with the correct valve springs and camshaft  ...with titanium valves, locks, and retainers you can get as much as 8000rpms with hyd rollers these days.
Also, you can modify the hyd rollers to act like a solid, while maintaining enough plunger travel to be deemed legal in the NHRA stock classes, where these modified hyd rollers are quite common. And, the Renegade boys are spinning 7500+ rpms with hyd roller lifters... 
I run a set of SRP modified hyd rollers that work great at the 7000rpm shift points on my previous setup... I will either be shifting at 7k or just over on the next combo as well with, you guessed it, hyd roller lifters.
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not to get off the subject(i think), but no one every talked about lubrication for 7000 RPM's. what pan? what scraper? what girdle? what oil pump? HVLP? what type of oil pump? this i think is VERY important also i want to build mine to run 6500 MAX rpm's safely. so basically it is a question for me and vettereatr and anyone else who doesnt know.