Originally Posted by
alleycatoo
Well now!! It looks like some of the str8 rodders are starting to ring in! Hot dawg! We'll see where it goes. Do I have some new ideas about str8's? You better believe it. Some ideas I've been working on for 20+ years. Finely got a answer. Tested 'em in other engines, holy mmmmoly! I will be fireing up my 263 this summer, with my old perf stuff on it as I want to establish a approximate base line for compairison.
32: HOLY COW!! Yowza! Whoo-Hoo! Yah!! I gots to have me one of those valve covers!! Hot dang!! Right arm! No guts No glory!! Bang On! I was about to seal up my wood finned cover buck, paint it silver as a temporary. Send me one! I'll send you dead presidents or what ever else you might want! As cast! No prob! I'll machine it to suit! The multi-carb you may want to rethink. I have several str8 manifolds made back in the day. A Howard 5-carb specificly. Looks cool. 'bout all I can say about it. Perhaps a engine might run with it. Maybe. The exact problem is that the plenum is WAY too big. Any "log style" manifold has too much. And, the runner, even on bone stock manifolds, is way too short for the rpm range the str8 operates in. So, what to do? Put small plenums under the carbs, connecting tubes to each plenum, no bigger than 1"x1" smaller may even be better. Exit the plenums to the out side of the engine, not facing the engine. Stub out, put the taper, not much, 2*-3*, in the stub out. Drop down, run the runner under the manifold, it'll be 3-4" longer than stock. You might even be able set the manifold out a little and squeak another 1" in. Nothin but good. This would be amanifold that will make power, you'll know it. Runners for a str8 can't be long enough, well, there are practical limits, but you get the idea. alleycat
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