If you’re looking for a take-no-prisoners big-block for your
Sportsman racecar, the 720-horsepower ZZ572/720R—the
"R" stands for Race—is your answer. It simply is the most
powerful big-block crate engine ever offered by
GM Performance Parts and is our first factory-engineered
drag racing engine.
With the Gen VI tall-deck Bowtie block as its foundation,
the engine builds on the popular ZZ572/620 crate engine,
but adds reconfigured rectangular-port heads that combine
with the forged pistons to squeeze out a 12:1 compression
ratio—yes, racing gas is a must! A solid roller cam with
.714-inch lift lets the ports take deep, deep breaths. Roller
rocker arms and strong chromemoly retainers ensure
accurate valvetrain performance at high rpm levels—
up to the engine’s 6750-rpm limit.
The ZZ572R/720R is rated at 720 horsepower at 6250 rpm
and produces 685 earth-moving pound-feet of torque at
4500 rpm. Of course, the engine is built with the best
heavy-duty parts in GMPPs arsenal, including a 4340
forged steel crankshaft, shot-peened forged steel rods,
forged aluminum pistons will full-floating wrist pins,
stiff dual valve springs and a louvered oiling windage
tray. Distinctive "572 CHEVROLET" cast aluminum valve
covers complete the package.
GMPP suggests making your engine build-up easier by
ordering the ZZ572/720R Deluxe. We integrated, durabilitytested
and validated this combination and determined it
works best with the Deluxe version’s 1090-cfm Demon
four-barrel carburetor, tall-deck single-plane intake manifold,
HEI distributor, aluminum short-style water pump and
8-mm spark plug wires. Just add our lightweight starter
and it’s ready to rock the competition!
Old P/N 12498827 (had Demon carb - now Holley)
