Speedmaster®
Chevy LS 6.0L Gen IV B-4.000 M-STD DH-9.240 6-Bolt Billet Main Iron Engine Block
Product Information
Overview
The next level of performance are these cast-iron Chevy LS blocks. Designed to look standard under your bonnet, and work with stock components. The Speedmaster block is ready for the street racer or all-out racer with added strength and cubic inches. All the factory flaws redesigned to be eliminated, while still using the water jacket design. The Speedmaster blocks are cast from high-density iron with extra-thick cylinder walls and decks.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE286.1058.01 |
| Part Type: | Engines, Bare Block |
| Cylinder Bore Diameter: | 4.000 in. |
| Bore & Stroke: | 3.622 in. x 4.000 in. Max Recommended |
| Cam Journal OD: | 2.164 in. - 2.166 in. |
| Deck Height: | 9.240 in. |
| Fuel Pump : | Electrical |
| Fuel Pump Pushrod: | N/A |
| Lifter Bores (in.): | 0.843 in. - 0.844 in. |
| Main Bearing Size (in.): | 2.558 in.-2.559 in. |
| Main Bearing Bore (in.): | 2.750 in.-2.751 in. |
| Main Cap Bolts: | 6 Bolt |
| Main Cap Press: | 0.005 in. |
| Oil System: | Wet Sump |
| Oil Pan: | Standard LS |
| Rear Main Seal (in.): | Standard LS 4.527 in. |
| Starter: | Standard LS |
| Stud Holes, Head: | Blind Holes |
| Timing Chain/Gears: | Standard LS Components |
| Timing Cover: | Standard Cam Location LS |
| Weight: | 205 Lbs @ 4.0 in. Bore |
| Quantity: | Sold individually. |
| Notes: | Check hood clearance before installing. No provision for Active Fuel Management |
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
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.