383 Red Line

guzzimike said
Hmmm...

My 1969 383 with Crane stamped (adjust) rockers, Isky Hydraulic lifters and single spring revvs past 6500 RPM with no apparent valve Float..

Yes we know. With non stock parts you can make them rev higher but that is not what this thread is about.

If you were running a stock cam with stock springs 6500 would be pointless.