6800 RPM with hyd roller lifters is impressive! Two years ago the magazines were touting that they were somewhat of a work in progress with premature valve float still an ongoing problem. The roller foot combined with the hyd mechanism makes for a hefty overall assy.
It's been a few years but when I spoke with Crane tech on the subject they left me with the impression they wern't too keen on applications way above 6000 RPM. They didn't say they wouldn't go there, just really implied a big concern.
I still think this is a good potential application for the Comp "Beehive" valve springs. Higher RPM with less spring, means more power and reliability. David Vizzards experiance to date indicates that they will run a typical street roller valve train to 2-300 rpm more while the seat load drops from 145 to 130 lbs. and over the nose from 345 to 310 lbs.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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