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PERFORMANCE
GM
PARTS
Ignition System:
The HEI (High Energy Ignition) distributor part number 93440806 included with the 350HO Deluxe engine and is a
self-contained ignition system that includes a magnetic pickup, a module, a coil, a rotor, and a cap. The HEI's
large diameter cap minimizes arcing and cross-firing between adjacent spark plug terminals. The cap's male
terminals provide a reliable, positive connection for the spark plug leads. However, the HEI's large diameter cap
may interfere with other underhood components in vehicles not originally equipped with HEI ignition systems.
Check for adequate clearance before installation. This HEI distributor has a hardened (melonized) drive gear that
is compatible with a steel camshaft. Use of a non-hardened distributor gear will result in excessive wear.
The HEI system requires a 12 volt power supply for proper operation. The HEI ignition system should be connected
directly to the battery with 10 or 12 gauge wire through a high quality ignition switch. If you are installing an HEI
ignition in an early-model vehicle originally equipped with a point-type ignition, be sure to remove or bypass the
resistor in the wiring harness to ensure the HEI receives 12 volts continuously. Use distributor connector package
Part number 12167658, which includes connectors and wires for the HEI's tachometer and 12 volt terminals.
Set spark timing at 32º before top dead center (BTDC) at 4000 RPM with the vacuum advance line to the distribu-
tor disconnected and plugged. This setting will produce 32º of total advance at wide open throttle (WOT). The HEI
vacuum advance canister should remain disconnected. This engine is designed to operate using only the internal
centrifugal advance to achieve the correct timing curve.
Oil Pan / Filter / Adapter / Dipstick:
The 350HO Deluxe engine includes an oil pan part number 12557558 the same pan as the production ZZ4. This is
a four quart, right-hand dipstick oil pan and gasket.
The 350HO Deluxe engine assembly includes an oil filter adapter but no oil filter element. The 350HO uses an AC
# PF 25 oil filter. A premium oil filter (AC # UPF25) is available for your 350HO engine. This has a 100% wire
backed synthetic media with 6 micron filtration.
The oil dipstick for the 350HO Deluxe engine is on the right-hand (passenger) side of the block and is included with
the 350HO Deluxe engine.
Carburetor / Air Cleaner:
A 670 cfm Holley four-barrel carburetor with vacuum operated secondaries and electric choke is included with the
350HO Deluxe engine. You may need to change jets and or adjust your carburetor to suit your environment (i.e. altitude
and ambient temperatures) and driving style.
A foam or paper element, low restriction air cleaner should be used to protect the engine from excessive wear and
diffuse the air entering the carburetor. The fuel mixture distribution can be upset if no diffuser is used, causing
poor power and misfiring at high engine speeds. Always check for adequate hood clearance when installing a new
air cleaner. GM Performance Parts has two chrome 14" air cleaner assemblies for single 4 barrel engines.
12342071 is the Classic design and 12342080 is the high performance design.
Spark Plugs / Spark Plug Wires:
The 350 HO Deluxe engine's cast iron cylinder heads have straight spark plugs. Check for spark plug and wire clearance
when using exhaust manifolds or aftermarket headers designed for straight plugs. Sparkplug wires, GM Part Number
12361057 are installed on the 350 HO Deluxe engine. These wires have 90° sparkplug boots, and the GM Performance
Parts logo.
Caution
This engine assembly needs to be filled with oil and primed. You should add the specified oil (see start-up
instructions) to your new engine. Check the engine oil level on the dipstick and add accordingly.
350HO Deluxe Engine Specifications
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.
REV16JL08
PART NO.
DATE
REVISION
GENERAL MOTORS
SERVICE PARTS OPERATIONS
6200 Grand Pointe Drive, Grand Blanc, MI 48439
12487544
5
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