Cliff is correct a factory iron intake can and do run well into the 9's.
Jay DeLaigle's 1974 Trans Am with his '455 FAST ENGINE' stroked to 501 cubic inches is a good example. Take note of the work performed to his intake....
1974 Pontiac EGR cast iron intake, Ported and flowed by Wilson Manifolds with support from Jon Kasse racing engines and SD performance.
Wilson Manifolds , top dogs in the intake modification industry. Pricey work I bet !
Cliff and Paul K comments are well taken, the RPM intake can shine above 500 hp.
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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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