The standard firing order for a Chevrolet small-block 350 V8 is 1-8-4-3-6-5-7-2.
This sequence determines which cylinder receives a spark in each step of the engine’s rotation, coordinating with the distributor rotor to provide smooth power delivery. While most 350s use this exact order, always confirm with your specific engine’s service manual if you’ve swapped components or are working with a non-standard build.
Understanding the firing order
To ensure correct ignition timing and plug wire placement, connect the distributor rotor so that the sequence follows the order below. The numbers indicate the factory cylinder numbering, not the order on the cap itself, which cycles through the same sequence as you rotate the distributor.
Before listing the firing sequence, note that the following sequence applies to the typical Chevrolet small-block 350 engine used in countless cars and light trucks. Using the correct order helps prevent misfires, rough running, and potential engine damage.
- 1
- 8
- 4
- 3
- 6
- 5
- 7
- 2
In practice, this means the spark plugs are wired in the sequence 1-8-4-3-6-5-7-2 around the distributor cap. If you’ve set timing or rebuilt the ignition system, re-check the rotor position at TDC on the firing stroke to ensure the first cylinder aligns correctly.
Cylinder numbering and practical mapping
To map the numbers to the physical cylinders on a typical SBC 350, use the factory convention described below. This helps you wire the distributor and ignition components without confusion.
- 1 — Front cylinder on the passenger-side bank (nearest the timing cover)
- 2 — Second from the front on the passenger-side bank
- 3 — Third from the front on the passenger-side bank
- 4 — Rear (last) cylinder on the passenger-side bank
- 5 — Front cylinder on the driver-side bank
- 6 — Second from the front on the driver-side bank
- 7 — Third from the front on the driver-side bank
- 8 — Rear (last) cylinder on the driver-side bank
Always verify cylinder mapping against your engine’s manual, especially if you’re working with non-standard builds or marine applications, where configurations might differ.
Summary
The Chevrolet small-block 350’s standard firing order is 1-8-4-3-6-5-7-2. Map the numbers to the corresponding physical cylinders as described, and ensure correct rotor alignment at TDC for reliable ignition timing. When in doubt, consult the engine’s service manual or a qualified technician.