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What is the plug gap on a 235 Chevy?

The plug gap on a 235 Chevy engine refers to the distance between the tip of the spark plug and the engine's cylinder head. This gap is crucial for proper ignition and efficient combustion within the engine. In this article, we'll explore the importance of the plug gap and provide guidance on how to properly set it for optimal performance.


What is the Plug Gap on a 235 Chevy Engine?


The plug gap on a 235 Chevy engine is the space between the center electrode and the ground electrode of the spark plug. This gap allows the spark to jump across and ignite the air-fuel mixture in the engine's cylinder. The recommended plug gap for a 235 Chevy engine is typically between 0.035 and 0.045 inches.


Why is the Plug Gap Important?


The plug gap plays a crucial role in the engine's performance and efficiency. If the gap is too small, the spark may not be able to jump across, resulting in a weak or misfiring ignition. Conversely, if the gap is too large, the spark may not be able to generate enough energy to ignite the air-fuel mixture effectively. Both scenarios can lead to decreased engine power, reduced fuel efficiency, and potentially even engine damage over time.


How to Set the Plug Gap on a 235 Chevy Engine



  • Locate the spark plugs on the engine, typically accessible from the top or side of the engine block.

  • Use a spark plug gap tool or feeler gauge to measure the existing gap between the center and ground electrodes.

  • If the gap is not within the recommended range of 0.035 to 0.045 inches, carefully bend the ground electrode to adjust the gap accordingly.

  • Recheck the gap with the tool or gauge to ensure it is within the proper range.

  • Repeat the process for each spark plug on the engine.


It's important to note that the plug gap should be checked and adjusted periodically, as it can change over time due to normal engine wear and tear. Maintaining the correct plug gap is essential for optimal engine performance and fuel efficiency.

What is the plug gap on a small block Chevy?


The Chevy 350 spark plug gap is 0.035 inches.
Make sure the spark plugs are clean and free of dirt and other debris. Use your feeler gauge or gap gauge to measure the current gap.



Is it better to have a bigger or smaller spark plug gap?


Those with modified engines must remember that higher compression or forced induction will typically require a smaller gap setting (to ensure ignitability under higher pressure). The voltage requirement is directly proportional to the gap size. The larger the gap, the more voltage is needed to jump the gap.



How often should you change spark plugs in a 5.3 Vortec?


Typically, experts recommend changing the spark plugs every 30,000 miles.



What is the firing order on a 235 Chevy engine?


Firing Order & Timing: 235 6 Cylinder Chevrolet Engine ( Inline 6 ) Firing Order 235 Chevrolet 6 Cylinder Engine (Inline 6 ): 1-5-3-6-2-4 How to set Ingnition Timing: Set the octane selector at “0” on the scale (Figure Below) Now attach a Neon Timing Light to the engine and run it at idling speed with light aimed at ...



What would be a reasonable gap setting for a spark plug?


The gap setting is different for each vehicle but most are somewhere between 0.028" and . 060". Consult the owner's manual or Champion ® catalog to find the recommended setting for the vehicle you're working on.



What is the spark plug gap for a 5.3 engine?


The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.



What is the gap on a factory spark plug?


The gap setting is different for each vehicle but most are somewhere between 0.028" and . 060".



How do I know if my ignition timing is correct?


If you hear telltale signs of the timing of your car not being quite right, such as pinging, backfiring, or if the car runs too rich or too lean, you will need to either take it to a mechanic or adjust the timing yourself.



What is the correct spark plug gap?


between 0.028″ and 0.060″
To put it simply, the gap is the space between the central and side electrodes. This spacing is pivotal, dictating the spark intensity, which is crucial for efficient combustion. Vehicle manuals provide the ideal gap, which usually ranges between 0.028″ and 0.060″.



What is the timing setting for a 1955 Chevy 235 engine?


On a stock 235, the timing pointer should be JUST touching the RIGHT side of the flywheel ball marker (5 degrees before tdc).


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.