5.7 Chevy Firing Order [With Diagram]

This firing order applies to Chevy small block V8 engines produced from 1955 to 1998, including the popular 350 cubic inches (5.7-liter) engine. The engine will run smoothly if your spark plugs are fitted properly. The engine will run more smoothly and efficiently.

The 5.7 Chevy applies to Chevrolet small block V8 engines that have a displacement of 5.7 liters (350 cubic inches). This firing order has been used in various models of Chevy vehicles, including the Camaro, Corvette, and Silverado, among others. The 5.7 firing order is not universal and it can depend on the engine type and manufacturer.

Chevy 5.7 Firing Order

  • 1-8-4-3-6-5-7-2.

Explanation of 5.7 Chevy firing order

The 5.7 Chevy firing order is 1-8-4-3-6-5-7-2, which means that the cylinders fire in the following order:

  • Cylinder 1 fires first, followed by cylinder 8.
  • Cylinder 4 fires next, followed by cylinder 3.
  • Cylinder 6 fires after that, followed by cylinder 5.
  • Finally, cylinder 7 fires, followed by cylinder 2.

The firing order of an engine specifies the sequence in which the cylinders receive a spark from the ignition system, which is necessary for the engine to run properly. The 5.7-liter Chevy engine has eight cylinders arranged in a V-configuration, with four cylinders on each side of the V.

The firing order is designed to ensure that the engine runs smoothly and efficiently. Firing the cylinders in a specific sequence helps to balance the engine’s power output and minimize vibration. The firing order is in a proper sequence. As a result, it improves engine efficiency and reduces emissions.

The firing order applies to 

  • Small-Block V8
  • LS1
  • LT1
  • L31

Torque Specifications 

Fastener TypeTorque Specs
Main Cap Bolt (396-427, 2-Bolt)95 ft.-lbs.
Main Cap Bolt (396-454, 4-Bolt, Inner and Outer)110 ft.-lbs.
3/8 in. Connecting Rod Bolt50 ft.-lbs.
7/16 in. Connecting Rod Bolt67-73 ft.-lbs
Cylinder Head Bolts, Long75 ft.-lbs
Cylinder Head Bolts, Short65-68 ft.-lbs
Screw-In Rocker Arm Studs50 ft.-lbs.
Intake Manifold Bolts (Cast Iron Head)25 ft.-lbs.
Oil Pump Bolt65 ft.-lbs.
Cam Sprocket Bolts20 ft.-lbs
Harmonic Damper Bolt85 ft.-lbs
Flywheel/Flexplate Bolts60 ft.-lbs.
Pressure Plate Bolts35 ft.-lbs.
Bellhousing Bolts25 ft.-lbs.
Exhaust Manifold Bolts20 ft.-lbs.

Firing orders with similar vehicles

  • Chevrolet Camaro
  • Chevrolet Corvette
  • Chevrolet Impala
  • Chevrolet Caprice
  • Chevrolet Chevelle
  • Chevrolet Monte Carlo
  • Chevrolet Blazer
  • Chevrolet G-Series van
  • Chevrolet C/K
  • 1500/2500/3500 pickup trucks
  • Chevrolet Impala SS

What happens if the firing order is incorrect on a 5.7 Chevy engine?

If the firing order is incorrect on a 5.7 Chevy engine, it can cause a variety of engine performance problems. Since the firing order specifies the sequence in which the cylinders receive a spark from the ignition system, an incorrect firing order can cause the spark plugs to fire at the wrong time, which can result in several issues, such as Rough idle, Misfiring, Reduced power, Poor fuel economy, and Engine damage

Check Out 454 Firing Order

What is the compression ratio of a 5.7 Chevy engine?

Generally, Chevy small block V8 engines, including the 5.7-liter engine, have compression ratios in the range of 8.5:1 to 11:1. The ratio of a 5.7 Chevy engine depends upon the specific model.

It’s worth noting that the compression ratio can be changed by modifying the engine components, such as the cylinder heads or pistons. However, any modifications to the engine should be carefully considered and performed by a qualified mechanic to ensure that they are safe and effective.

What is the spark plug gap for a 5.7 Chevy engine?

as a general guideline, the spark plug gap for a 5.7 Chevy engine is typically in the range of 0.040 to 0.060 inches. The gap between spark plugs for a 5.7 Chevy engine depends upon the model and engine style.  It is always best to refer to the owner’s manual or a repair manual for the correct spark plug gap for your particular engine.

Engine performance can be affected by the spark plug. It’s quite essential to ensure the gap is correct. A gap that is too small can cause misfires and poor engine performance, while a gap that is too large can cause the spark to weaken, making it difficult to start the engine.

What is the horsepower and torque rating of a 5.7 Chevy engine?

The horsepower and torque ratings of a 5.7 Chevy engine depend upon the specific model.

Here are some examples of the horsepower and torque ratings for different versions of the 5.7-liter Chevy engine:

The 1996-2000 Chevrolet Suburban 1500 with the 5.7-liter engine had a horsepower rating of 255 hp and a torque rating of 330 lb-ft.

The 1998-2002 Chevrolet Camaro SS with the 5.7-liter engine had a horsepower rating of 320 hp and a torque rating of 345 lb-ft.

The 2003-2004 Chevrolet Corvette Z06 with the 5.7-liter engine had a horsepower rating of 405 hp and a torque rating of 400 lb-ft.

Jake Mayock
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