I built a 455 with 6X heads for a friend. The heads were ported, and it had a solid roller cam. That engine ran 10.90's @ 122-123 MPH in Phoenix[73 Firebird]. He had it chassis dynoed one summer in 100+ degree heat. It has a TH400 in it also. It dynoed at 485 HP to the rear wheels. If that car had a 25% drivetrain loss, then the engine would have been making 606 to the flywheel. There is no way that engine made 600 HP. 550 flywheel HP is more like it. That's about where it dynoed on our engine dyno. That's only about a 12% drivetrain loss by my calculations. So, based off these numbers, I get more like 304 rear wheel HP from yours.
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Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
You killed it, We build it!
520-294-5758
64 GTO, under re-construction, 412 CID, also under construction.
87 S-10 Pickup, 321,000 miles
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86 Bronco, 218,000 miles
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