---
title: What Are the Specifications of the Discontinued PSLS4271CT Engine?
description: "Meta Description: Learn the basic specifications of the discontinued PSLS4271CT 427 LS3 stroker engine, including horsepower, torque, compression ratio, and components."
---

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# What Are the Specifications of the Discontinued PSLS4271CT Engine?

### Is this engine still able to be purchased?

***No we have discontinued this engine.***

What Are the Key Engine Specifications?

**The PSLS4271CT is a 427 CID (7.0L) LS3-based stroker engine producing 625 horsepower and 565 lb-ft of torque.**

### Basic Specifications

- **Engine Part Number:** PSLS4271CT
- **Displacement:** **427 CID (7.0L)**
- **Horsepower:** **625 HP**
- **Torque:** **565 lb-ft**
- **Compression Ratio:** **11.0:1**
- **Engine Family:** GM LS3
- **Fuel System:** Electronic Fuel Injection (EFI)
- **Reluctor Wheel:** 58X
- **Balance:** Internal
- **Crank Flange:** 6-bolt

 What Components Are Used? The PSLS4271CT was built with a forged rotating assembly for strength and durability.

### Bottom End

- Forged steel crankshaft
- Forged I-beam connecting rods
- Mahle forged pistons
- Internal balancing

### Top End

- BluePrint LS3 rectangle-port aluminum cylinder heads
- 70cc combustion chambers
- 2.165" intake valves
- 1.590" exhaust valves
- Upgraded factory-style roller rockers

 What Camshaft Is Installed? **Comp Cams Hydraulic Roller Cam**

- Lift: **.624" intake / .624" exhaust**
- Duration @ .050": 
    - **239° intake**
    - **255° exhaust**
- Lobe Separation Angle: **114°**
- Installed Intake Centerline: **110°**

 What Fuel Does It Require? Because of its **11.0:1 compression ratio**, the engine should be operated with:

- **91-octane or higher premium fuel**
- Fuel pressure of **58-60 PSI** for EFI applications

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