"An installed height of +/- 0.020 inches is acceptable."
https://www.motortrend.com/how-to/16...spring-height/
Once you have determined the shortest installed height, it will be necessary to use shims to obtain this height (±.020” is acceptable) on the remaining valves.
https://www.compcams.com/valve-springs-101
I've seen one source that stated +/_ 0.010 but that was not the norm
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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
Last edited by Steve C.; 06-01-2023 at 10:09 PM.
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