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Bullet-proof design
435 lb.-ft. of torque
Heavy duty rods
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 doesn't 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 it's 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 trailer's worth of weekend fun is barely noticeable when hooked to a vehicle equipped with the HT383.
The bottom end has a forged steel 383 stroker crankshaft, heavy-duty rods, and hypereutectic pistons. The block is cast iron with 4-bolt main caps, and it's up to the task of making lots of power for years to come.
| 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'c1 intake / 206'c1 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'c1 total @ 4000 rpm with vacuum advance disconnected |
| Maximum rpm: |
5000 |
**This part is shipped via truck freight, additional shipping charges will apply. Multiple truck freight parts on an order may increase the shipping amount.
Note: Crate engine shipping charges have two components; Commercial Delivery (Free) & Residential Charge.
The commercial shipping delivery to a freight terminal or commercial address ((provided the commercial address has a forklift to unload the product). If the product is shipped to a residential address there is an additional cost of $300 for the use of a lift-gate vehicle. Please call USM (888-876-7223) for any questions.
Truck Freight: Most Truck Freight items have two standardized shipping rates, one rate to the terminal, another to your door. Additional fees apply for lift gate service; to avoid this you can choose terminal pickup.
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