Years ago Lee Atkinson changed from a Ultradyne 231/239 at .050"/ 108 LSA hyd flat tappet cam to a Ultradyne solid flat tappet cam with 247/247 at .050"/ 108 LSA and he picked up about 2-tenths and 4 mph ( best of 11.27 at 199.61 mph, I think ).
I know its not apples-to-apples but note the amount of increase in inatke duration. It was a street car and he commented his driveability not not suffer with the change.
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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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