The firing order for the 6.0L GM LS V8 is 1-8-7-2-6-5-4-3. In LS engines, GM numbers cylinders across two banks (odd numbers on one bank, even numbers on the other), and this sequence is standard across the family.
Firing order and cylinder mapping
The following sequence shows which cylinder fires in which position during each engine cycle. This order is used by most 6.0L LS variants, including popular truck and car applications, and is applicable to engines such as the LS1-based 6.0s and later generations.
- Cylinder 1 fires first
- Cylinder 8 fires second
- Cylinder 7 fires third
- Cylinder 2 fires fourth
- Cylinder 6 fires fifth
- Cylinder 5 fires sixth
- Cylinder 4 fires seventh
- Cylinder 3 fires eighth
Understanding this sequence helps with ignition wiring layouts, misfire diagnosis, and timing checks, especially on engines built with coil-on-plug ignition systems common to the LS family.
Ignition system context
The 6.0 LS family uses coil-on-plug ignition and does not rely on a traditional distributor. When wiring or diagnosing, ensure each coil is connected to its designated cylinder in the 1-8-7-2-6-5-4-3 order, matching the engine's cylinder numbering convention.
Summary
In short: the 6.0L GM LS V8 fires in the order 1-8-7-2-6-5-4-3. This firing sequence is consistent across the LS family, with cylinder numbers arranged as odd-numbered cylinders on one bank and even-numbered cylinders on the other. Ignition timing is controlled by coil-on-plug packs rather than a distributor.
What side is odd and even on LS?
Cylinder Arrangement: As with earlier V8s, the LS engines have cylinders numbered with odd numbers on the left and even numbers on the right.
Why did LS change firing order?
GM adopted a special firing order in its LS engine series (Gen 3 and 4), which feature a 4/7 and 2/3 swap for the same reasons…to smooth out the harmonics in the pursuit of greater engine durability and to potentially generate more power.
Do LS and SBC have the same firing order?
Reduced crankshaft torsional vibration was the main reason GM adopted the LS engine's 1-8-7-2-6-5-4-3 firing order (4-7/2-3 swap for SBC).
Is a 6.0 a 400?
Understanding the 6.0 Liter Engine Size and Comparisons
A 6.0 liter engine refers to its displacement, approximately 366 cubic inches, larger than a 350 (5.7L) or 400 (6.6L) motor.