[Excaliber]

I recently replaced the 660 cfm "center squirter" Holleys (yeah, two of them) on my FE. These are high dollar "drag race" carbs with no PV's and mechanical secondaries.

They were a "two speed" carb. Go like hell, and a real mean idle. Anything in between just wasn't worth much for the street.

Twin 600 vaccum secondaries with PV's were MUCH better for the street and I suspect will be for road racing also. Pretty good idle to, considering my radical cam and all. IF I had my choice I'd go with center pivot floats also, for road race application.

"Bog", off the line WAS an issue that could be overcome with the correct "launch". But it was tricky to get it right.