Ray Allen versus Jack Werst '1970 SS/EA Showdown'

[K Stubbs]

Originally Posted by Paul Ceasrine

1970/1971 LS-6 Intake Manifold
Chevrolet Part #3963569
Low-Riser Big Block Dual-Plane

Carburetor Holley 800 CFM (1 11/16" x 1 11/16")
Square bore carburetor mount / rectangular-shape intake port

The Low-Riser was required, to allow for proper hood clearance.
Intake was for both the Corvette and Chevelle SS454 LS-6 cars.

Why didnt anyone use the "474" highrise manifold back then? It even had an open plenum.