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Fuel Pump:
This ZZ383 engine does not include a fuel pump. The fuel system must be capable of supplying adequate fuel volume at a
minimum of 6 psi pressure when the engine is operating at wide open throttle (WOT). A high volume, in-line electric fuel pump is
available from Chevrolet Performance Parts, part number 25115899. This heavy duty pump flows 72 gallons per hour at 6-8 psi
outlet pressure.
Also, the ZZ383 engine has a provision for a mechanical fuel pump. There are two mechanical fuel pumps available from
Chevrolet. Part number 12355612 is recommended for street performance. Part number 12355613 is recommended for
competition.
Spark Plugs/Spark Plug Wires:
The recommended spark plugs for the ZZ383 engine are part number 19300749 (AC# R44LTS). These are for general street and
performance use. If you plan to use this engine mostly for competition racing, you may want to change to a colder spark plug such
as R42LTS. If you are installing the engine in a vehicle originally equipped with a small block V-8 with high energy ignition (HEI),
standard replacement spark plug wires can be used. The ZZ383 engine does not include spark plug wires. Part number 12361051
can be used. These heavy-duty wires come with 90° spark plug boots, and the Chevrolet Performance logo stamped on the wires.
Chevrolet Performance sells a spark plug wire loom kit, part number 12496806. The brackets in this kit are stainless steel, with the
"Bow Tie" logo laser cut into them. This kit can be used with the ZZ383. The brackets bolt to the side of the cylinder heads.
PCV System:
The ZZ383 engine does not come with rocker cover grommets. It is recommended to use grommet part number 3989350 with
these rocker covers.
1. Install PCV valve, part number 6487779, into the grommet in the rocker cover on the left hand side of the engine.
2. Attach one end of the PCV hose, part number 9438373, to the PCV valve. Attach the other end of the hose to the rear port on
the carburetor.
3. Add a breather to the right valve cover such as 19131218. The PCV system must have a fresh air intake to function properly.
Thermostat:
It is recommended that the cooling system have a 180°F thermostat, part number 10202456. Also, use thermostat housing, part
number 10108470, and gasket, part number 10105135.
Distributor:
GM recommends the use of the HEI distributor, part number 93440806, on the ZZ383 engine. It was used throughout the
testing on this and many of their other crate engines and has passed various tests. The HEI Distributor incorporates a hardened
(melonized) drive gear that is compatible with a steel camshaft. Use of a non-hardened gear will result in excessive wear. To
install the distributor use connector, part number 8917052, to attach the tachometer wire to the distributor. You will also need a
distributor hold-down clamp, part number 10096197, and fastener, part number 09439905, to secure the distributor to the intake
manifold. When installing the distributor it is recommended to use a "Moly-Lube" type lubricant applied to the distributor gear. Coat
the gear generously with the Moly-Lube using a small brush. This lube will aid in the break-in of the distributor gear and camshaft
gear upon start up.
Headers:
The ZZ383 High Performance engine should be installed with a pair of high performance headers for maximum performance.
The headers used during development of the ZZ383 had 1.75" diameter primary tubes. Primary tubes were approximately 32.00"
in length and had 3.00" diameter collectors. Using a similar combination in your application, along with a performance exhaust
system with a balance tube ("H" pipe) and low restriction mufflers, will provide you with optimum performance from your ZZ383
High Performance engine.
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ZZ383 Performance Crate Engine
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