Regarding the valve springs. You stated the cylinder heads were, quote.... "The heads are pre-assembled ones"
And weeks ago I suggested they were the single valve springs with no damper, p/n 5767.
If in fact they are installed at 1.800" then Edelbrock rates them at 120 lbs on the seat. And as already suggested they should of been tested.
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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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