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MSZ ACCEL 0416S4 U Groove Spark Plug Header Plug P15366664MSZ-ACC-0416S4 https://cdnimages.opentip.com/full/MSZ/MSZ-ACC-0416S4.jpg ACCEL 0416S4 U Groove Spark Plug Header Plug Manufacturer Part Number: 0416S4U-Groove Spark Plug Header Plug; 14mm Thread; Shorty Plug For Headers; .750 in. Reach; Champion RC12/RC13/RC14 Heat Ranges; 4 Pack;Header-BoxACCEL U-groove performance spark plugs produce a larger spark for more power at high RPMs. Improves throttle response and fuel economy, less fouling. Purified alumina insulator prevents arcing. Machine rolled threads protect heads.Header-Box; U-Groove Ground Electrode; Five-Rib Aluminum Insulator; Copper Core Nickel/Chrome Steel; Electric Heat Seal; Copper-Glass Gas-Tight Seal; Less Flame DissipationBrand: ACCELManufacturer Part Number: 416S-4Manufacturer: HolleyAssembled Product Weight: 0.55 lbModel: 0416S-4Assembled Product Dimensions (L x W x H): 0.90 x 3.60 x 4.90 Inches 15366664 743047113073 0.5000lbs 1.00 3.30 3.30
Accel
40.3765 2027-01-05 5 In Stock
customer review - by , October 10, 2025
5/ 5stars
About 1/4 inch shorter which was all I needed. And copper core should work better for my SBC.
customer review - by , January 1, 2025
5/ 5stars
I love these on my 502 BBC, with the headers I have no room at all, these helped.
customer review - by , April 4, 2022
4/ 5stars
These are not a short plug. There are same length as other plugs

ACCEL 0416S4 U-Groove Spark Plug Header Plug

stars Rating 5 | 3 reviews
Brand Accel
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UPC: 743047113073
SKU: MSZ-ACC-0416S4
Price: $40.38
Quantity:
5 In Stock
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Product Description

Manufacturer Part Number: 0416S4

U-Groove Spark Plug Header Plug; 14mm Thread; Shorty Plug For Headers; .750 in. Reach; Champion RC12/RC13/RC14 Heat Ranges; 4 Pack;
Header-Box
ACCEL U-groove performance spark plugs produce a larger spark for more power at high RPMs. Improves throttle response and fuel economy, less fouling. Purified alumina insulator prevents arcing. Machine rolled threads protect heads.

Header-Box; U-Groove Ground Electrode; Five-Rib Aluminum Insulator; Copper Core Nickel/Chrome Steel; Electric Heat Seal; Copper-Glass Gas-Tight Seal; Less Flame Dissipation

Brand: ACCEL
Manufacturer Part Number: 416S-4
Manufacturer: Holley
Assembled Product Weight: 0.55 lb
Model: 0416S-4
Assembled Product Dimensions (L x W x H): 0.90 x 3.60 x 4.90 Inches

warning tips WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.

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This product is not eligible for coupon code discount, for we've been offering the best price in the market.
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Customer Reviews
5 out of 5
5 stars
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4 stars
1
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1 stars
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By doug alexander
Date: October 03, 2025
About 1/4 inch shorter which was all I needed. And copper core should work better for my SBC.
Rating: 5 stars [5 of 5 Stars!]
By Dr. Craig D. Smith
Date: January 01, 2025
I love these on my 502 BBC, with the headers I have no room at all, these helped.
Rating: 5 stars [5 of 5 Stars!]
By James r Allen
Date: April 14, 2022
These are not a short plug. There are same length as other plugs
Rating: 4 stars [4 of 5 Stars!]
Items 1 - 3 of 3 reviews
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