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Terri coyle
Reviewed in the United States on September 15, 2024
Great value, car runs great
Tristan Abrey
Reviewed in Canada on May 7, 2024
Can’t find them local for some reason. Great option, fast shipping
Alan Whittier
Reviewed in the United States on July 17, 2023
Great quality plug will buy again
Crimefighter
Reviewed in the United States on October 13, 2019
Wrong fitment
Customer
Reviewed in the United States on November 21, 2018
Good plug
Ahmed
Reviewed in the United States on December 1, 2016
Great product
Mr. Skip
Reviewed in the United States on September 26, 2014
Used for years in my BBC drag car. Excellent plug. Never had a bad one out if the box. Other heat range plugs from NGK have been excellent also.
chasqui
Reviewed in the United States on November 6, 2014
I modified a chevy 350 to 382.5 and was using autolite plugs. I was changing plugs every 500 miles due to them misfiring all the time. Did some research and tried the NGK 4091. This plug did the trick. I have over 3000 miles on the plugs and the engine fires immediately, no misfiring. Very satisfied.
C.B.
Reviewed in the United States on December 22, 2012
If your like me, your going to go through a few sets on an engine build especially when you actually use the engine as intended. not every engine build is the same especially when it's not a "crate engine" .... Once you get the correct heat range and can run the plug - they're awesome. I have them in my big block and my small block. Bottom line. Excellent!
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