---
title: What Firing Order Does My BluePrint Engine Use?
description: Find the correct firing order, distributor rotation, and cylinder numbering for BluePrint SBC, BBC, Ford, LS, and Small Block Chrysler engine
---

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# What Firing Order Does My BluePrint Engine Use?

## Knowing the correct firing order is important when installing spark plug wires, diagnosing ignition issues, setting timing, or verifying distributor installation. Using the incorrect firing order can result in: No start condition Backfiring Poor idle quality Misfires Loss of power

### *** Small Block Chevy (SBC)***

Most BluePrint Small Block Chevy engines use:

**1-8-4-3-6-5-7-2**

Common applications:

- 350
- 383
- 400
- 406
- 427 SBC

Distributor rotation:

**Clockwise**

---

### ***Big Block Chevy (BBC)***

Most BluePrint Big Block Chevy engines use:

**1-8-4-3-6-5-7-2**

Common applications:

- 454
- 489
- 496
- 502
- 540

Distributor rotation:

**Clockwise**

---

### ***Small Block Ford (SBF)***

Most BluePrint Small Block Ford engines use the 5.0 H.O. firing order:

**1-3-7-2-6-5-4-8**

Common applications:

- 302
- 306
- 347
- 351W
- 408W
- 427W

Distributor rotation:

**Counterclockwise**

---

### ***LS Engines***

All BluePrint LS engines use:

**1-8-7-2-6-5-4-3**

Common applications:

- PSLS3760CTF
- PSLS3763CTF
- PSLS4270CTF
- PSLS4275CTF

---

### ***Small Block Chrysler***

Most BluePrint Small Block Chrysler engines use:

**1-8-4-3-6-5-7-2**

Common applications:

- 360 Magnum
- 408 Magnum

Distributor rotation:

**Clockwise**

---

### ***Cylinder Numbering***

### Chevrolet SBC & BBC

Driver Side:

- 1
- 3
- 5
- 7

Passenger Side:

- 2
- 4
- 6
- 8

---

### Ford Small Block

Passenger Side:

- 1
- 2
- 3
- 4

Driver Side:

- 5
- 6
- 7
- 8

---

### LS Engines

Driver Side:

- 1
- 3
- 5
- 7

Passenger Side:

- 2
- 4
- 6
- 8

---

### Small Block Chrysler

Driver Side:

- 1
- 3
- 5
- 7

Passenger Side:

 2

- 4
- 6
- 8

---

***Frequently Asked Questions***

### My engine backfires after installing spark plug wires. What should I check?

Verify the firing order and distributor rotation. Incorrect wire placement is one of the most common causes of a backfire after installation.

### What happens if two plug wires are swapped?

The engine may misfire, backfire, run rough, or fail to start.

### Does distributor rotation matter?

Yes. Always route wires following the correct firing order and distributor rotation direction.

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