Jay S post is worth noting...
"Service life has not shown itself to be a factor with HR cam profiles using SR needle type lifters unless for some reason SR spring pressures are used."
I have a few buddies who have run hydraulic roller profiles with Crower 66260 solid roller lifters with no issues.
Example, one with Dave Bisschop's Old Faithful cam and the other with his Roadpaver cam. One local fellow drove his car weekly for years.
I remember years ago I asked my Comp Cams rep we worked with at the time about it. He told me a minimum of 150 lbs seat pressure AFTER run in.
This was with the Old Fathful cam. I know others have run much more pressure.
( Information provided in this post does not represent any endorsement. And unless specified it is not based on personal experience and is offered for general interest only )
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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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