have been using these plugs for years in all of my non-overhead cammed engine, they just dont seem to agree with the overhead engines but are excellent in anything else. always have saw slight fuel milage gains and noticable throttle responce. i do think that its odd that the plugs are different prices on this site for different part numbers, whereas on other sights, every plug is the exact same price ($5.99)
How often do you shop at JC Whitney.com?Multiple Times a Year
Very good plugs
PostedJanuary 13, 2015
I like the design and results from Diamond Fire plugs. Pre set gap and great design make them good purchase. Improved performance and smooth running engine was exactly what I was looking for. The plugs did both.