Speedmaster®
Chevy SBC 350 3.75" 383ci 2Pc RMS Forged Rotating Assembly Only
Product Information
Overview
Specs
| Brand: | Speedmaster |
| Part Number: | PCE290.1114 |
| Part Type: | Engine Rotating Kit |
| Product Line: | 4340 Forged Steel |
| Actual Engine CID: | 383 |
| Engine Stroke (in): | 3.750 in. |
| Balanced: | No |
| Pistons Included: | Yes |
| Piston Rings Included: | No |
| Piston Oversize (in): | Varies by bore selected |
| 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: | H-beam |
| Connecting Rod Length Center to Center (in): | 5.700 in. |
| Rod Bearings Included: | No |
| Rod Bearing Undersize (in): | Stock |
| Main Bearings Included: | No |
| Main Bearing Undersize (in): | Stock |
| Cam Bearings Included: | No |
| Gaskets Included: | No |
| 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
Crankshaft
Speedmaster forged standard weight crankshafts are designed for street or race engines with substantially increased horsepower. Speedmaster crankshafts are precision-ground, heat-treated, shot-peened, inspected, and micro-polished for superior tolerance control. Speedmaster crankshafts are also nitride-hardened for superior wear resistance, have straight-shot and chamfered oil holes, and feature lightening holes in all rod throws. These crankshafts also have a large radius on all journals for improved strength and wear resistance.
Connecting Rods
Speedmaster H-beam connecting rods are one of the strongest connecting rods available. Speedmaster H-beam connecting rods are perfect for supercharged and nitrous applications. These rods incorporate a special doweled cap for specific cap-to-rod alignment and are profiled with extra clearance for stroker applications.
Speedmaster 'H' Beam Street / Strip connecting rods are manufactured from aircraft quality 4340 chromoly steel. The rods are x-rayed and ultrasonically tested with all surfaces shot peened and stress relieved.
Pistons
Speedmaster Forged pistons are made from 4032 aluminum alloy for quieter operation and reduced piston to wall clearance. Up to 20% lighter than traditional forged pistons that eliminate harmful stress concentrations for superior strength. Specifically designed for naturally aspirated or moderate nitrous applications.
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.