So does this mean Pontiac is a big block?
Rules say "Normally aspirated domestic V8 production passenger car big block engine types
only. Pontiac, AMC, Oldsmobile, Cadillac Pontiac, Buick, Ford FE, Ford 385 series including Boss 429, Chevrolet big block including 10.2-inch deck blocks and W Series, Chrysler B and RB Wedge permitted. Chrysler Hemi engine prohibited."
Minimum displacement 450 cubic inches. Maximum displacement unlimited. Cubic inch is calculated by bore x bore x stroke x 6.2832.
Any domestic OEM passenger car block of an eligible engine type, or commercially available cast iron or cast aluminum aftermarket OEM replacement engine block permitted. Engine block must retain OEM cylinder bore spacing and OEM block angle.
NOTE: This class WILL use a cubic inch divider in scoring to
compensate for varied engine displacement. Scored test rpm range
So, the Pontiac engine produced the most HP per CI as factored against the other engines. Other engines made more HP, but they also had more cubes to get there. Cubic inches rule, but a Pontiac engine has proven that it can pull the most HP per CI out of a single carbed engine. Isn't that called "efficient?" I call it PERFECT