Cadillac 1967 VVI Data Book page 94

New Quadra jet Carburetor
Cadillac's new four-barrel carburetor has the two primary (smaller)
barrels designed to increase the velocity of incoming air; this permits
more precise metering of the fuel-to-air ratio for maximum smoothness and
economy. The secondary barrels are now larger for increased air capacity
with a resulting gain in performance under initial full throttle conditions.
New choke mounting on intake manifold permits better matching of the
richness of the fuel mixture to requirements of the engine for efficient
warmup. New float bowl now centered between carburetor primary barrels
provides added assurance against engine cut-out on abrupt turns.
Pistons and Crankshaft
Contributing to the smooth and instant response of the Cadillac engine are
the short, rigid crankshaft and lightweight aluminum pistons designed to
minimize friction and starting inertia. New precision in cylinder bore
finish and piston ring design further reduces friction and contributes to
oil economy.
New Valve Train and Camshaft
For increased quietness and lower inertia the rocker arms for 1967 are of
a stamped metal design, of lighter weight and mounted on a strong but
light, sintered iron "tee" support. New cam contours are also designed for
quieter valve operation.
Exhaust System
Cadillac's Coaxial Resonator exhaust system is scientifically designed to
produce resonances or impulses of sound which oppose and cancel out
sound impulses from the engine. Refinements for 1967 include a new
stainless steel mesh for expansion control in the resonator for even greater
quietness.
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