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#1
10-18-2025, 08:39 PM
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"I bet in Powells opinion the Pontiac exhaust is choked, probably compared to other cylinder heads."
X2 Related: NOTE the revised exhaust port design on Paul Kinippen's new Edelbrock cylinder heads.
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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 Last edited by Steve C.; 10-18-2025 at 08:56 PM. |
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#2
10-18-2025, 10:28 PM
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Is a iron D port head that’s been ported using rare oversized iron manifolds and a 3” head pipe a good candidate for a 236/242 hr cam or would you want a little more exhaust duration?
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86' |
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