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CRATE ENGINES BIG-BLOCK<br />
HT502<br />
88890534<br />
All the towing power your truck needs<br />
and then some!<br />
Our big-torque HT502 crate engine has more pull than a tugboat w<strong>it</strong>h a<br />
stroker motor. Its robust 512-lb-ft rating (at 3300 rpm) means <strong>it</strong> has the<br />
towing power for almost any trailer. In other words, <strong>it</strong>’ll turn the Rocky<br />
Mountains into mole hills.<br />
GM never offered a regular-production 502-cubic-inch Big-Block, but the<br />
GM Performance Parts HT502 is a popular, economical choice for truck<br />
owners seeking to re-power their old, 454-powered truck w<strong>it</strong>h greater<br />
power and capabil<strong>it</strong>y. It is uniquely su<strong>it</strong>ed to pre-1976 trucks, but is<br />
adaptable to a variety of applications.<br />
We build the HT502 w<strong>it</strong>h large 4.47-inch bores and a 4.00-inch stroke.<br />
The crankshaft, rods and pistons are all forged for maximum strength;<br />
and they’re installed in a new version of the Big-Block cylinder block. It is<br />
updated for greater strength and performance capabil<strong>it</strong>y. (See page 230<br />
for details.) Deep breathing chores on the highway are the job of iron,<br />
oval-port heads, while a conservative 8.75:1 <strong>com</strong>pression ratio ensures<br />
pump-gas performance at all alt<strong>it</strong>udes and engine loads.<br />
All necessary <strong>com</strong>ponents are available from GM Performance Parts. So,<br />
go ahead. Load up your race car, parts and a weekend’s worth of support<br />
equipment. The HT502 will deliver you and your equipment w<strong>it</strong>hout<br />
breaking a sweat.<br />
Check out gmperformanceparts.<strong>com</strong> for a list of Power Packages<br />
to improve the performance of this engine!<br />
delivers Big torque<br />
new Big-Block casting<br />
377 Hp / 512 lB-ft torque<br />
INSTALLATION NOTES<br />
• Requires the add<strong>it</strong>ion of carburetor, intake<br />
manifold, water pump, starter, distributor and<br />
ign<strong>it</strong>ion system<br />
• Clutch linkage bosses are now drilled and<br />
tapped. When using cast-iron exhaust manifolds,<br />
lower head bolts may need to be replaced w<strong>it</strong>h<br />
bolts w<strong>it</strong>h shorter heads for clearance<br />
• New for 2009, 502 engines now have a<br />
mechanical pump boss!<br />
• Comes w<strong>it</strong>h an externally balanced 14” automatic<br />
transmission flexplate. Use externally<br />
balanced flywheel P/N 14096987 and 11” clutch<br />
assembly for manual transmission applications<br />
• Designed for pre-1976 street vehicles or any<br />
off-road vehicle<br />
• Not intended for marine applications<br />
12568782<br />
502 Partial engine<br />
This brand-new partial engine includes<br />
forged reciprocating <strong>com</strong>ponents, as<br />
well as the balancer, oil pan and<br />
timing chain set.<br />
CRATE ENGINES BIG-BLOCK<br />
Ht502 dynO CHArt<br />
POssible APPliCAtiOns*<br />
Ht502 teCH sPeCs<br />
your Big-Block mud-bogger<br />
a tow rig that needs an att<strong>it</strong>ude<br />
adjustment<br />
a pickup truck that can pound most<br />
sports cars<br />
*Applications have not been validated.<br />
They are merely suggestions of how you<br />
might enjoy your GM Performance Parts<br />
crate engine. Some applications may affect<br />
engine warranty. See page 352 for specific<br />
warranty information. Some applications<br />
may not be emission-legal; check state and<br />
local ordinances.<br />
Engine Type (P/N 88890534): Chevy Big-Block V-8<br />
Cylinder Heads (P/N 12562917): Iron oval port; 118cc chambers<br />
Displacement (cu in): 502<br />
Valve Size (in):<br />
2.07 intake / 1.73 exhaust<br />
Bore x Stroke (in): 4.47 x 4.00<br />
Compression Ratio: 8.75:1<br />
Block (P/N 19170540):<br />
Cast-iron w<strong>it</strong>h 4-bolt main caps Rocker Arms (P/N 12523976): Stamped steel<br />
Crankshaft (P/N 10183723):<br />
Forged steel<br />
Rocker Arm Ratio: 1.7:1<br />
Connecting Rods (P/N 19170198): Forged steel, shot peened<br />
Flexplate (P/N 10185034): 14"<br />
Pistons (P/N 12533507):<br />
Forged aluminum<br />
Re<strong>com</strong>mended Fuel:<br />
92 octane<br />
Camshaft Type (P/N 12552296): Hydraulic roller<br />
Ign<strong>it</strong>ion Timing:<br />
Base 4° BTDC, 26° Total<br />
Camshaft Lift (in):<br />
.480 intake / .483 exhaust<br />
Maximum Re<strong>com</strong>mended rpm: 5500<br />
Camshaft Duration (@.050 in): 204° intake / 209° exhaust<br />
Balanced:<br />
External<br />
NOTE: Distributor w<strong>it</strong>h melonized steel gear MUST be used w<strong>it</strong>h long blocks and partial engines w<strong>it</strong>h steel camshafts, or engine damage will occur.<br />
Available for purchase online at<br />
gmperformanceparts.<strong>com</strong><br />
GM Performance Parts Crate Engines include a 24-month<br />
or 50,000-mile/80,000-kilometer lim<strong>it</strong>ed warranty.<br />
GM Performance Parts does not utilize any used<br />
or remanufactured parts in this crate engine.<br />
For a <strong>com</strong>plete list of parts to <strong>com</strong>plement and finish this engine, turn to page 114.<br />
100 Buy online at www.gmperformanceparts.<strong>com</strong><br />
Buy online at www.gmperformanceparts.<strong>com</strong><br />
101
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