>
> I assume you're planning on casting/machining your own heads in
>order to flow enough air for ~400 HP? Stock-derived heads/valves are
>unlikely to be able to flow that much even with major mods, I suspect.
>
> Sounds interesting and fun, but 8500 or 9000 rpm may be pushing
>things past the hairy edge, even for a race engine, especially given the
>breathing limitations of the heads. Perhaps I'm confused and there are
>known ways to hit those levels and still keep everything together for more
>than a handful of engine-hours.
>
>--
>Randell Jesup
Actually, most of the Boat guys were running these Offenhouser High Rise
Tunnel rams, others had tri-power, one had the old Hilborn FI, and another
had 4 Webers. Head work was one of their keys to winning. They didn't tell
me, but I think many of them were runnin the Buick 300 heads. They ALL told
me that that they were very tough and reliable in those RPM ranges. No
remember though, that all of these were running the stock stroke of 2.8" No
strokers were allowed, it's not to hard to build Ford 289's that can turn
8,000+ RPM as they have a 2.89" stroke, but you'll never see (not without
spending 100K or more) a big block long stroke engine turn these kind of
RPM.
Obviously, breathing is critical to get there, and still produce
significant HP, but I don't expect or need max HP at that point more like
5,000 to 6,500, but still be able to spin it up to 9,000.
On the Subject of breathing, I know the Old F-85 JetFire had a turbo
charger. I don't like Turbos due to the added HEAT the can generate.
However, I do like Super chargers. Is there anyone running a Paxton super
charger on any 215 engine? or any of the GMC 371, or 471 (Ithink those are
the numbers) small scale blowers?
Thanks
Rich
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