---
title: What Are the Specifications for the Discontinued BluePrint Engines 493 Cubic Inch Chrysler Big Block?
description: Specifications for the discontinued BluePrint 493 Chrysler stroker engine, including compression ratio, balancing, valvetrain, clearances, and torque values.
---

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# What Are the Specifications for the Discontinued BluePrint Engines 493 Cubic Inch Chrysler Big Block?

### ***What Are the Basic Engine Specifications?***

**Engine Family:** Chrysler RB Big Block **Displacement:** 493 Cubic Inches (7.2L) **Base Engine:** Chrysler 440 (1968-1975) **Configuration:** Stroker V8 **Compression Ratio:** **9.6:1** **Fuel System:** Carbureted **Camshaft Type:** Hydraulic Flat Tappet **Balance Style:** **Internally balanced front and rear** **Cylinder Heads:** Aluminum performance heads What Rotating Assembly Was Used? The engine was assembled with:

- Forged steel stroker crankshaft
- Forged H-beam connecting rods
- Forged aluminum pistons
- Internally balanced rotating assembly

 The combination was designed for strong street performance while maintaining durability for extended use. What Cylinder Heads and Valvetrain Were Used?

### Cylinder Heads

- Aluminum performance cylinder heads
- Big Block Chrysler configuration

### Valvetrain

- Hydraulic flat tappet camshaft
- Shaft-mounted rocker arm system
- Hardened pushrods
- Hydraulic lifters

### Valve Adjustment

**Hydraulic lifter preload: 3/4 turn past zero lash** What Camshaft Timing Should Be Used? The engine documentation requires:

- Camshaft must be degreed during assembly
- Target installation: **110° intake centerline ±1°**

 Proper cam degreeing is critical for correct engine performance, idle quality, vacuum, and power output. What Compression and Oil Pressure Should Be Expected?

### Compression Test

**195-205 PSI** Compression readings can vary based on:

- Engine temperature
- Elevation
- Cam timing
- Gauge accuracy
- Overall engine condition

### Oil Pressure

**40-60 PSI** Oil pressure should be checked at operating temperature using a known accurate gauge. What Bore and Deck Specifications Were Used?

### Cylinder Bore

- Standard bore reference: **4.320"**
- Production build configured with **.040" overbore**

### Finished Deck Height

**9.485" ± .001"**

### Piston Position

 Piston protrusion should be maintained between:

- **.004" below deck**
- **.002" above deck**

 What Clearances Were Used During Assembly?

### Main Bearing Clearance

**.0006" - .0027"**

### Connecting Rod Bearing Clearance

**.0005" - .0029"**

### Piston-to-Wall Clearance

**.0035" - .005"** These clearances should always be verified during any rebuild or major service. What Ring End Gaps Were Used? The piston rings were file-fit during assembly.

### Top Ring

**.020" - .022"**

### Second Ring

**.022" - .024"** Proper ring gap is critical for ring seal and engine durability. What Torque Specifications Were Used?

### Main Caps

**85 ft-lbs with moly lubricant**

### Connecting Rod Bolts

**63 ft-lbs with moly lubricant**

### Rocker Shaft Assemblies

**35 ft-lbs**

### Cylinder Heads

 Torque in three stages:

1. **30 ft-lbs**
2. **50 ft-lbs**
3. **70 ft-lbs final torque**

 Use moly lubricant on head bolt threads and under bolt heads. What Fuel and Ignition Systems Were Used?

### Fuel System

 The engine was equipped with:

- Mechanical fuel pump
- Performance fuel delivery components
- High-performance 4-barrel carburetor calibration

### Ignition System

- HEI-style performance distributor
- Matching ignition coil
- Conventional spark plug wire system

### Firing Order

**1-8-4-3-6-5-7-2** What Additional Engine Features Were Included? The engine was originally supplied with:

- Aluminum intake manifold
- Complete ignition system
- Fuel system components
- Water pump
- Valve covers
- Oil pan
- Timing cover
- Tinware and accessory components

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