Yes for the traditional Chevy small-block 350 V8: the standard firing order is 1-8-4-3-6-5-7-2. If you’re dealing with an engine labeled 350 that’s actually an LS-family design, that engine uses a different firing order.
Understanding firing orders in Chevy V8 engines
A firing order dictates which cylinder receives a spark and fires in each step of the crankshaft’s rotation. For most Chevrolet small-block V8s—historically the 283, 327, 350, and 400 cubic inch engines—the sequence has been standardized. This sequence affects how spark plug wires are arranged on the distributor cap and how a camshaft’s lobes interact with the crank to produce smooth, even power.
Chevy small-block 350 firing order
The traditional small-block Chevy 350, along with its close SBC siblings, uses the following firing sequence:
1 → 8 → 4 → 3 → 6 → 5 → 7 → 2
Maintaining this order is essential for proper timing and smooth operation in most classic SBC builds. When wiring or diagnosing a SBC, sticking to this sequence helps ensure consistent power delivery and minimizes misfires.
Note: If you are working with a different engine family that Chevrolet has used over the years, or a modern variant that’s marketed as a “350” but is actually an LS-based design, the firing order can differ. Always verify the engine family and year-specific specifications before wiring.
Exceptions and related engines
Not all Chevrolet engines with a 350 cubic inch displacement share the same firing order. Key distinctions include:
- Chevy small-block V8s (the classic SBC 350) generally share the 1-8-4-3-6-5-7-2 firing order across generations.
- LS-family engines (often labeled 5.7L, 6.0L, 6.2L) use a different firing order: 1-8-7-2-6-5-4-3. These are not typically referred to as “small-block Chevy 350.”
- Marine or high-performance variants may have special configurations, but they usually adhere to the engine family’s standard firing order; always consult the exact manual for precise wiring.
- If you install a reverse-rotation distributor or otherwise alter the cam/crank arrangement, the effective firing sequence could change, requiring rewiring to maintain proper timing.
For any work, confirm the engine family (SBC vs. LS) and year with the service manual or a reliable spec sheet before wiring or timing adjustments.
Summary
In short, the firing order for Chevy’s traditional small-block 350 is consistently 1-8-4-3-6-5-7-2 across most SBC applications. Engines labeled as “350” that belong to the LS family use a different order (1-8-7-2-6-5-4-3). Always verify the specific engine family and year to ensure correct timing and wiring.
What happens if cylinder numbering is incorrect?
Symptoms of an incorrect firing order include:
Engine turns over but won't start. Rough running or loud misfires. Loss of power or stalling.
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What's the firing order for a Chevy 350?
The firing order for a Small Block Chevy (SBC) 350 is typically 1-8-4-3-6-5-7-2, and the distributor rotates clockwise. "The firing order is 1-8-4-3-6-5-7-2. Number 1 cylinder is on the right side as your facing the motor and closest to the front of the motor."
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How to tell if SBC is at TDC?
Into the number one plug. Hole. Watch the tool as it rises or extends outward when it stops moving stop rotating the crank. And check the timing marks look for the mark on the balancer.
Is a 350 bored 30% over a 383?
A 383 is a . 030" over-bore, and when comparing this to a "350" cubic inch engine, we should compare it with a . 030" over bore 350 as well, to keep a level playing field because if you were going to rebuild your existing 350, it will probably end up being bored .
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