Posted for conversation...
https://www.motortrend.com/how-to/he...s-performance/
Note on the graph it states "inside" diameter. Take note of the tubing used on the headers involved, are they based on a popular 16 gauge or 18 gauge materiel.
Example if 16 gauge: .062" thick x 2 sides = 0.124"
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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