Spark Plug Indexing Washer/Tool Set Analog Super-Tuning Kit

Super-tune your engine with analog tuning kits from Speedway Motors. Improve power, acceleration, and economy, while learning how to get the most out of your engine...the old fashioned way. You don't need expensive ignition boxes or ugly coil-on-plug ignitions to build a fun, responsive engine (just ask Mickey, Smokey and Grumpy...the mechanics, not the dwarfs).

"Indexing" a spark plug positions the electrode (ground strap) towards the nearest cylinder wall, away from the middle of the chamber. This unshrouds the spark kernel, increasing the speed at which the fuel is burned. A faster burn rate allows adjustment of ignition timing/spark advance to a more ideal crank angle, resulting in more power.

Due to manufacturing processes, there is no guarantee the threads are positioned the same on any two plugs, or that the threads in the cylinder head are consistent from chamber to chamber. In other words, chances are if you screw a plug into the head, it won't put the electrode in the same position as all the others.

These spark plug indexing washers come in varying thicknesses, allowing you to tailor both the position and depth of the electrode within your combustion chamber. If your cylinder heads are on the engine (indexing an assembled engine), no sweat - the included indexing nut and top-dead-center indicator make it easy to place the electrode correctly within the chamber.

Kit Contents:

Top Dead Center Indicator

Positive stop to locate top dead center. A must for cam checking with heads on. For 14 mm plug thread.  Stop bolt thread 3/8"-16

Moroso 62160 Spark Plug Washer Indexing Nut Indexer Tool, 14mm

High-compression race engines require “indexing” of spark plugs to prevent contact between the piston dome and ground wire of the spark plugs. Moroso’s indexer, designed for both flat and taper-seat 14mm spark plugs, enables selection of spark plugs that will not make such contact. Once a given plug is selected (placed in a cylinder head and found to have the correct ground wire position), it is placed in the Moroso Plug Indexer and the position of the ground electrode marked on the black anodized surface. Marking provides a reference for checking other plugs to be used in the same cylinder.

• Designed for both flat and tapered seat 14mm spark plugs
• Black anodized for easy marking
• Hex-head design allows it to be held in a vise

Spark Plug Indexing Washers, 14mm Tapered Seat, 30 Pk

These washers come in varying thicknesses, allowing you to tailor both the position and depth of the electrode. Package contains ten (10) copper washers of each thickness (0.30mm, 0.50mm, and 0.80mm), which may be reused if not over tightened.

• Fits all 14mm spark plugs with a tapered seat
• Made from stamped copper material for proper sealing and heat transfer
• Can be reused if not overtightened
• Includes 3 thicknesses with 10 washers in each size (30 total per package)

Spark Plug Thread Cleaner

Here's a handy tool for cleaning spark plugs holes. Made for 14mm or 18mm threads, and does a great job of cleaning without damage.

Plug Indexing Washers Instructions (PDF)