Originally Posted by ap72
An RPM manifold will walk all over it.
Doug Flynn at Holley told me their dual plane Stealth (now Speed
Warrior) manifold makes better power than the X-CELerator up to almost 6000 RPM. So, unless your engine spends most of its time above 6000 RPM, a dual plane is the way to go. The Street
Warrior places an emphasis on low-mid range torque, but even it probably kicks the X-CELerator's butt up to 4500 RPM or so.
Just because the engine will run at 1500 RPM with an X-CELerator doesn't mean the power band goes anywhere near that low. Being required for a certain racing class is the ONLY reason to use one.
Jeff, I love the old school stuff, even some GM 283/327/350 cams. But this manifold is a relic.