Quote:
Originally Posted by bill dedman
Gary,
I believe the "mystery motor" was the canted-valve, new head-design, N.A.S.C.A.R. motor that we came to know as the 396/427/454 engine. The Z-11 was a 409 on steroids; angled top-deck block; a "combustion-chambers-in-the block" design with some really good-flowing heads and an intake manifold, the design of which emulated a tunnel-ram (raised carbs, with vertical runners delivering the charge to the heads.)
A VERY powerful engine...
The cranks may have had similar bearing parameters, and the bore-center spacing was the same, but they were two very different motors in terms of the top end.
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Bill, I may stand corrected on that (even though I thought I read in a performance book and/or Chevy performance magazine that Z11 was also associated with the 427 engine that was popular in the '63 Chevies of that great era, but I'm no authority on that). However, the important thing is that Z11 wasn't associated in any way shape or form with the Citation...it was the X11, which I know of for sure. There was also a Z26 offering which was connected with the now defunct Beretta, or the Z34 from the Lumina.