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GM
CRATE ENGINE ZZ4
The ZZ4 GM Crate motor generates 355 horsepower.
This is our most popular GM Crate Engine, and you can see
why!
Imagine an aluminum head small
block that makes 355 horsepower. What if it had a steel roller
camshaft, four bolt main block, undercut rolled fillet crankshaft, high silicon
pistons and strong PM connecting rods?
We
imagined it, and then engineered, developed, tested and built
it. The ZZ4 is the evolution of our popular ZZ series of small blocks that power thousands of street rods, hot street
cars, circle track racers and drag racers. With over
400 ft.lbs. of torque, the ZZ4 is the best way to put an aluminum
head, roller cam, high performance small block
between your favorite fenders.
The aluminum angle plug cylinder heads have screw in rocker
studs, 1.94" intake and 1.50" exhaust valves and
58cc combustion chambers that yield a crisp and responsive
10 to 1 compression ratio. Also included are our
lightweight valve spring retainers that weigh half as much
as our previous design. The valve seats are radiused
and we’ve included valve stem seals to help keep the oil where
it belongs.
To compliment the cylinder head design, we’ve incorporated
a steel roller tappet camshaft with .474" intake and
.510" exhaust valve lift.
The combination makes 355 horsepower
at 5250 rpm and has that great sounding
muscle car idle, with just enough lope to let people know
that this is no station wagon engine.
Also included with the ZZ4 is an HEI distributor with an ignition
timing advance curve developed for performance,
a dual plane aluminum intake manifold that accepts your spread
bore or square bore carburetor, an 8" high-RPM
torsional damper, 12.75" auto trans flex plate and cast
iron water pump.
The ZZ4 is currently our most popular crate engine, and you
can see why. With a long history of successes in
circle track and drag racing as well as street rods and other
performance applications, the ZZ4 may just be the
bullet for your next project.
The ZZ4 is not intended for marine use, and should only be
used in 1978 and earlier pre-emissions street vehicles or
any year off road vehicle s. All of this and it still comes
with a warranty.
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