Page 48 of GM Performance Parts 2006 Catalog by GM Parts Direct

CRATE ENGINES SMALL-BLOCK A big-inch small-block tuned for torque! There comes a time when you may not just want more power, you may need more power. Times like when you are towing your show car or bass boat with that 1970s-and-earlier GM truck, and it just doesnt have the low-end grunt that you need to flatten hills or make a safe pass. For those times, our engineers designed the HT (high torque) 383 with lots of cubic inches and other components to enhance the low-rpm power that you need. The GM Performance Parts HT383 has been specifically engineered for low-rpm torque, and its packed with durable parts that are all brand new. It produces 435 lb.-ft. of torque at 4000 rpm, but more importantly, it produces more than 400 lb.-ft. of weight-moving torque from 2500 rpm all the way up to its 4000 rpm peak. In other words, your trailers worth of weekend fun is barely noticeable when hooked to a vehicle equipped with the HT383. The bottom end has a 383 stroker forged steel crankshaft, heavy-duty rods, and hypereutectic pistons. The block is cast iron with 4-bolt main caps, and its up to the task of making lots of power for years to come. The brand new HT383 makes a great alternative to salvage and rebuilt engines. Once installed, the HT383 makes it possible to look forward to that big hill or long haul. Dont just drive to your favorite fishing hole be the first one there! 12499101 HT383 NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur. We recommend HEI distributor P/N 93448806. 46 GM Performance Parts does not utilize any used or remanufactured parts in this crate engine. GM Performance Parts crate engines include a twelve-month, 12,000-mile warranty. W HT383 TECH SPECS: Part Number: 12499101 Engine type: Chevy small-block V-8 Displacement (cu in): 383 Bore x stroke (in): 4.00 x 3.80 Block (P/N 88962516): Cast iron with 4-bolt main caps Crankshaft (P/N 12489436): Forged steel Connecting rods (P/N 12497624): Heavy-duty PM steel Pistons (P/N 12499103): Hypereutectic aluminum Camshaft type (P/N 14097395): Hydraulic roller Camshaft lift (in): .431 intake .451 exhaust Camshaft duration (@.050 in): 196 intake 206 exhaust Cylinder heads (P/N 12558060): Vortec iron; 64cc chambers Valve size (in): 1.94 intake 1.50 exhaust Compression ratio: 9.1:1 Rocker arms (P/N 10089648): Stamped steel Rocker arm ratio: 1.5:1 Water pump (P/N 88894341): Cast iron Recommended fuel: 87 octane Ignition timing: 32 total 4000 rpm with vacuum advance disconnected Maximum rpm: 5000 WHATS HOT? Lots of low RPM grunt 383 cubic inches on your side Forged steel crank

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