What is the spark plug gap on a 4.7 Dodge?
The typical spark plug gap for most 4.7-liter Dodge engines is 0.060 inches (1.5 mm). Always verify the exact specification for your model year and plug type in the owner’s manual or service documentation, as there can be variations.
Context: the 4.7L PowerTech family and ignition basics
The 4.7L PowerTech V8 has been used in several Dodge and Jeep applications since the late 1990s. While the basic ignition principle is consistent, exact spark plug gap recommendations can vary by year, ignition system details, and the specific replacement plug you choose. Always refer to the vehicle’s documentation or the plug packaging for the precise specification.
Official spark plug gap guidance for the 4.7L
In practice, the most commonly cited gap for the 4.7L PowerTech is 0.060 inches (1.5 mm). Some replacement plugs or service bulletins might list slightly different figures for certain configurations, so it’s important to confirm the exact value for your engine and plug type before installation.
Common reference values to consider while confirming your specification include:
- 0.060 inches (1.50 mm) — widely used as the standard gap for many 4.7L applications.
- 0.040 inches (1.00 mm) — occasionally listed for specific plug types or service scenarios; verify for your exact setup.
Bottom line: the primary guideline is 0.060 inches unless your documentation indicates a different value.
How to measure and set the spark plug gap
When replacing plugs, follow a careful process to ensure the gap is correct and the plugs seat properly in the cylinder head.
- Remove the new plug from its packaging and inspect it for damage or defects.
- Use a spark plug gap gauge to measure the actual gap and compare it to the target specification (commonly 0.060 inches / 1.5 mm for the 4.7L).
- If the gap is not correct, adjust it gently with a proper gap tool. To widen, carefully pry the ground electrode outward; to narrow, gently bend the ground electrode toward the center. Avoid applying excessive force or bending the center electrode.
- Re-check the gap after adjustment and install the plug, torquing to the manufacturer’s specification for your engine and plug type.
Note: Always torque plugs to the manufacturer’s specification and re-check the gap after installation once the engine has heated up, as metal expands with heat.
Summary
For most 4.7 Dodge engines, the spark plug gap is typically 0.060 inches (1.5 mm). However, always verify the exact specification for your vehicle’s year, model, and plug type via the owner's manual, service manual, or the plug packaging. Properly gapped and torqued plugs help ensure reliable starts, smooth idle, and optimal fuel efficiency.
