---
title: What Are the Basic Specifications of the Discontinued BluePrint BP4960CT 496 Big Block Chevy Engine?
description: Learn the specifications of the discontinued BluePrint BP4960CT 496 big block Chevy engine, including bore, stroke, compression ratio, valvetrain, and balance.
---

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# What Are the Basic Specifications of the Discontinued BluePrint BP4960CT 496 Big Block Chevy Engine?

### ***What Is the BP4960CT Engine?***

The **BP4960CT** is a **496 cubic inch Big Block Chevrolet stroker engine** built from a 454-based platform. Key features include:

- **496 cubic inch displacement**
- **4-bolt main block**
- **Two-piece rear main seal**
- **Flat tappet camshaft**
- **Large oval-port cast iron cylinder heads**
- **Forged connecting rods**
- **Cast steel stroker crankshaft**
- **Hypereutectic pistons**
- **Internally balanced rotating assembly**
- **Carbureted induction system**
- **Passenger-side dipstick oil pan configuration**

 What Are the Bore and Stroke Specifications? The BP4960CT uses a traditional big block Chevrolet stroker combination:

- **Bore:** 4.310 inches
- **Stroke:** 4.250 inches
- **Displacement:** 496 cubic inches

 The engine was produced using a **.060-inch overbore configuration**. What Type of Block Does It Use? The engine is based on a Chevrolet Mark IV style big block platform featuring:

- **4-bolt main block**
- **Two-piece rear main seal**
- **Mechanical fuel pump provisions**
- **Passenger-side dipstick oil pan**
- **Stroker-clearanced block machining**

 The block was modified to provide clearance for the longer-stroke rotating assembly. What Type of Rotating Assembly Does It Use? The BP4960CT features a balanced stroker rotating assembly consisting of:

- **Cast steel stroker crankshaft**
- **Forged steel I-beam connecting rods**
- **Hypereutectic aluminum pistons**
- **Moly piston rings**

 The engine utilizes an **internally balanced configuration**, eliminating the need for externally balanced flywheels or flexplates. What Compression Ratio Does It Use? The engine was built with approximately:

- **9.25:1 compression ratio**

 This compression ratio helps provide strong pump-gas compatibility while delivering significant torque. What Cylinder Heads Are Used? The BP4960CT uses:

- **Large oval-port cast iron cylinder heads**
- **2.25-inch intake valves**
- **1.88-inch exhaust valves**
- **Open-chamber big block Chevrolet design**

 The oval-port configuration provides excellent street torque and drivability while maintaining good airflow characteristics. What Type of Camshaft and Valvetrain Does It Use? The engine is equipped with:

- **Hydraulic flat tappet camshaft**
- **Hydraulic flat tappet lifters**
- **Adjustable valvetrain**
- **Stamped steel rocker arms**
- **7/16-inch rocker studs**
- **Hardened pushrods**

 Valve adjustment specification:

- **Zero lash plus 3/4 turn**

 What Intake and Fuel System Does It Use? The BP4960CT was supplied with:

- **Dual-plane aluminum intake manifold**
- **Performance carburetor application**
- **Mechanical fuel pump compatibility**

 The dual-plane intake design was selected to improve mid-range torque and street performance. What Balance Configuration Does It Use? This is an important service consideration. The BP4960CT uses:

- **Internal balance at the front**
- **Internal balance at the rear**

 Because the engine is internally balanced:

- **No weighted flywheel is required**
- **No weighted flexplate is required**
- Appropriate internally balanced components must be used

 What Oiling System Does It Use? The engine includes:

- **High-volume oil pump**
- **7-quart oil pan**
- **Windage tray**
- **Performance pickup assembly**

 The larger-capacity oiling system helps support high-load street performance applications. What Are the Basic Assembly Specifications?

| Specification | Value |
| --- | --- |
| Displacement | 496 CID |
| Bore | 4.310" |
| Stroke | 4.250" |
| Compression Ratio | 9.25:1 |
| Main Caps | 4-Bolt |
| Rear Main Seal | Two-Piece |
| Cam Type | Hydraulic Flat Tappet |
| Cylinder Heads | Cast Iron Oval Port |
| Fuel System | Carbureted |
| Balance | Internal Front and Rear |
| Oil Capacity Pan | 7 Quart |

 What Makes the BP4960CT Different From Other Big Block Chevy Engines? The BP4960CT combines the larger displacement of a stroker big block with components selected for reliable street performance:

- Large 496 cubic inch displacement
- Internal balancing
- Oval-port torque-producing cylinder heads
- Hydraulic flat tappet valvetrain
- High-volume oiling system
- Cast steel stroker crankshaft
- Forged connecting rods
- Pump-gas-friendly compression ratio

 This combination delivers strong torque output while remaining suitable for street-driven muscle cars, trucks, and hot rod applications. 

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