Page 52 of 2009 Performance Parts by GM Parts Direct

crate engines big-block ht502 crate engines big-block 88890534 all the towing power your truck needs and then some our big-torque ht502 crate engine has more pull than a tugboat with a stroker motor its robust 512-lb-ft rating at 3300 rpm means it has the towing power for almost any trailer in other words it ll turn the rocky mountains into mole hills gm never offered a regular-production 502-cubic-inch big-block but the gm performance parts ht502 is a popular economical choice for truck owners seeking to re-power their old 454-powered truck with greater power and capability it is uniquely suited to pre-1976 trucks but is adaptable to a variety of applications we build the ht502 with large 4.47-inch bores and a 4.00-inch stroke the crankshaft rods and pistons are all forged for maximum strength and they re installed in a new version of the big-block cylinder block it is updated for greater strength and performance capability see page 230 for details deep breathing chores on the highway are the job of iron oval-port heads while a conservative 8.75:1 compression ratio ensures pump-gas performance at all altitudes and engine loads all necessary components are available from gm performance parts so go ahead load up your race car parts and a weekend s worth of support equipment the ht502 will deliver you and your equipment without breaking a sweat delivers big torque new big-block casting 377 hp 512 lb-ft torque installation notes · requires the addition of carburetor intake manifold water pump starter distributor and ignition system · clutch linkage bosses are now drilled and tapped when using cast-iron exhaust manifolds lower head bolts may need to be replaced with bolts with shorter heads for clearance · new for 2009 502 engines now have a mechanical pump boss · comes with an externally balanced 14 automatic transmission flexplate use externally balanced flywheel p/n 14096987 and 11 clutch assembly for manual transmission applications · designed for pre-1976 street vehicles or any off-road vehicle · not intended for marine applications 12568782 502 partial engine this brand-new partial engine includes forged reciprocating components as well as the balancer oil pan and timing chain set check out gmperformanceparts.com for a list of power packages to improve the performance of this engine ht502 dyno chart possible applications your big-block mud-bogger a tow rig that needs an attitude adjustment a pickup truck that can pound most sports cars applications have not been validated they are merely suggestions of how you might enjoy your gm performance parts crate engine some applications may affect engine warranty see page 352 for specific warranty information some applications may not be emission-legal check state and local ordinances ht502 tech specs engine type p/n 88890534 displacement cu in bore x stroke in block p/n 19170540 crankshaft p/n 10183723 connecting rods p/n 19170198 pistons p/n 12533507 camshaft type p/n 12552296 camshaft lift in camshaft duration 050 in chevy big-block v-8 502 4.47 x 4.00 cast-iron with 4-bolt main caps forged steel forged steel shot peened forged aluminum hydraulic roller .480 intake .483 exhaust 204° intake 209° exhaust cylinder heads p/n 12562917 valve size in compression ratio rocker arms p/n 12523976 rocker arm ratio flexplate p/n 10185034 recommended fuel ignition timing maximum recommended rpm balanced iron oval port 118cc chambers 2.07 intake 1.73 exhaust 8.75:1 stamped steel 1.7:1 14 92 octane base 4° btdc 26° total 5500 external note distributor with melonized steel gear must be used with long blocks and partial engines with steel camshafts or engine damage will occur available for purchase online at gmperformanceparts.com gm performance parts crate engines include a 24-month or 50,000-mile/80,000-kilometer limited warranty gm performance parts does not utilize any used or remanufactured parts in this crate engine for a complete list of parts to complement and finish this engine turn to page 114 buy online at www.gmperformanceparts.com 101 100 buy online at www.gmperformanceparts.com

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