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Installation Notes
The big-block Chevrolet V-8 was introduced in 1965. During this period, there have been numerous revisions and design
changes to accommodate various chassis and engine configurations. The 502/502 engine assembly is manufactured on current
production tooling; consequently you may encounter dissimilarities between the 502/502 engine assembly and previous versions
of the big-block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a
502/502 engine when it is installed in a vehicle originally equipped with a big-block V-8 engine. However, there may be significant
differences in the flywheel bolt pattern, water pump, torsional damper, etc., between a 502/502 engine assembly and an older
big-block V-8 engine. These differences may require modifications or additional components not included with the 502/502
engine. When installing a 502/502 engine assembly in a vehicle not originally equipped with a big-block V-8 engine, it may
necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.
Whether or not your vehicle was originally equipped with a big-block V-8 engine, now would be a good time to check the rest of
your drivetrain to ensure that it can handle a 502 horsepower engine.
Tools Needed For Assembly
Torque Wrench
Engine Stand
6 point 3/8" Socket
13/16" Spark Plug Socket
Distributor Gear
A melonized distributor gear must be used in these 502/502 engine assemblies. The deluxe 502/502 engine assembly comes
with a melonized distributor gear. For the base 502/502 engine assembly you must install an HEI distributor, part number
93440806, with melonized gear or install a melonized gear on your distributor. Use part number 10456413 gear for 31/64"
diameter distributor shafts or use part number 10493532 gear for 27/64" diameter distributor shafts.
Oil Pressure Bypass Valves
502/502 engines come with two oil pressure bypass valves installed in the engine block. Both valves are rated at 11 psi pressure
differential. One valve is for the oil filter and the other valve is for the factory oil cooler. See Figure 1. If an aftermarket oil cooler
or remote oil filter is installed that attaches to the oil filter pad on the engine block, change the bypass valve for the oil filter in
the engine block. The aftermarket oil lines add resistance which may cause the bypass valve to stay open. The engine oil would
bypass the oil filter and the oil cooler. Change the bypass valve to one with a higher differential pressure rating. A good choice
would be part number 25161284 which is rated at 30 psi. Remove and replace the valve that is closest to the crankshaft with the
new valve. Press the new valve into the engine block and stake the new valve in three places. Do not change the bypass valve
for the oil filter for an adapter that angles the oil filter for clearance The bypass valve for the factory oil cooler is only used when a
factory oil cooler is installed. The factory oil cooler installs into the two ports located on the oil pan rail near the oil filter pad. The
lines for the factory oil cooler install with special adapters which contain an oil diverter. The oil diverter diverts engine oil into the
oil cooler. The bypass valve for the oil cooler can either be removed or be retained if a factory oil cooler is not used and the ports
are plugged. The bypass valve for the oil cooler is located above the adapter for the oil filter. When the bypass valve for the oil
cooler is removed the oil flows straight into the engine with less restriction. However, if a factory oil cooler is later added, install a
bypass valve for the oil cooler and use the factory adapters for the lines of the oil cooler.
502/502 Big Block Chevrolet Engine Pkg.
TITLE
1/2" Drill Motor
Utility Knife
Engine Hoist
9/16" Wrench
6 point 1/2" Socket
6 point 9/16" Socket
1/2" Drive Ratchet
3/8" Drive Ratchet
REV 16JA15
Long Flat Blade Screwdriver
12 point 3/8" Socket
6 point 5/8" Socket
12368083
PART NO.
2
63
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