" I believe they would not recommend one that is that that stiff."
I might want to retract that statement regarding the use of a higher rate spring.
Sorry, that was something I presumed since reading over the years about their SPLIT MONO LEAFSPRINGS and MONO LEAFSPRINGS that are lighter.
Agree with Paul the 300 rate springs work well. I've had a 1.43 60-ft with the Landrum springs and the Caltracs bars.
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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)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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