Comps valvespring recommendations typicaly run high, more like BBC stuff.
Cranes published info for hyd rollers say Small Block applications: 120-145 lbs seat pressure and Big Block applications: 130-165 lbs seat pressure.
Subject to some debate but I think the typical valve weight used in the Pontiac heads are not like a BBC application.
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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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