Speedmaster®
Chevy SBC 350 3.750" 383 ci 2Pc-Seal Rotating Assembly Kit - Sportsman Series
Product Information
Specs
| Brand: | Speedmaster |
| Part Number: | 1-290-005 |
| Part Type: | Engine Rotating Kit |
| Actual Engine CID: | 383 |
| Bore (in): | 4.030 in. |
| Engine Stroke (in): | 3.750 in. |
| Balanced: | No |
| Pistons Included: | Yes |
| Piston Rings Included: | Yes |
| Piston and Ring Oversize (in): | 0.030 in. |
| Piston Material: | Forged aluminum |
| Piston Style: | Flat top, with two valve reliefs |
| Piston Head Volume (cc): | -4.00cc |
| Wrist Pin Style: | Floating |
| Piston Ring Facing Material: | Plasma-moly |
| Crankshaft Included: | Yes |
| Crankshaft Material: | Forged 4340 Steel |
| Rear Main Seal Style: | 2-piece |
| Engine Balance: | Internal |
| Connecting Rods Included: | Yes |
| Connecting Rod Material: | Forged 4340 steel |
| Connecting Rod Beam Style: | I-beam |
| Connecting Rod Length Center to Center (in): | 5.700 in. |
| Rod Bearings Included: | Yes |
| Rod Bearing Undersize (in): | Stock |
| Main Bearings Included: | Yes |
| Main Bearing Undersize (in): | Stock |
| Cam Bearings Included: | No |
| Gaskets Included: | Yes |
| Oil Pump Included: | No |
| Camshaft Included: | No |
| Lifters Included: | No |
| Timing Chain and Gears Included: | No |
| Plastigage Included: | No |
| Assembly Lubricant Included: | No |
| Quantity: | Sold as a kit. |
Description
Speedmaster sportsman series rotating assemblies offer superior strength, performance and reliability. They include a Speedmaster forged 4340 steel crankshaft, Speedmaster I-beam 4340 connecting rods with ARP bolts, Speedmaster forged pistons, Speedmaster rings and 'King Bearings' Main & Connecting Rod Bearings. Speedmaster sportsman series rotating assemblies are the perfect choice for engines up to 900 hp and 3000-7500 RPM.
Warranty Information
Prop 65 Warning
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.