Skip to content
English
Go to www.blueprintengines.com
  • There are no suggestions because the search field is empty.

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.