★★★★★ 5
Perfect fit.
Works great, no leaks easy to install.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 31, 2025
Spark Plug Indexing Washers
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Spark Plug Indexing WashersIndexed Spark Plugs align the open end of the electrode towards the intake port. The hottest flame meets the new fuel charge for a performance gain, increases h. p, fuel mileage, & plug life. This is a speed secret car racers have used for years. You simply mark the electrode side of the plug with a magic marker on the porcelain. You then shim the plug with washers to align the electrode towards the intake port. Fits 14mm plugs. 4 washers in each kit.
Quick Dispatch:
Your Spark Plug Indexing Washers orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your Spark Plug Indexing Washers ships.
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Questions about Spark Plug Indexing Washers, sizing, or delivery? We're just an email away.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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