They are made in at least 3 and maybe 4 different sizes. Hopefully one of these will fit the cylinder head configuration with no or minimum modifications.
The article was using the cc26918 Beehive spring as an example, that's the sbc size with 1.290 O.D. and 140 seat pressure at 1.800" insalled height (I have also seen it listed 130 @ 1.800").
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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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