Re: Best Spark Plugs for C5, what are you using ? (c5vetteman)
I have been testing different sparkplug types related to misfire issues and at this time have a funny feeling NGK brand increases misfire.
For that brand I have tested the 44s and TR6 using gaps of 0.38 to .060.
I had less misfire when using Autolite's version that is a step colder as a TR6 is and got less misfire.
I have took plugs, their wires and even the coils from pistons with no misfire and swapped them with ones that did have misfire and of all the swaps, vendor brand caused amount of misfires a piston has.
Re: Best Spark Plugs for C5, what are you using ? (Jochen)
I have used the Bosch Platinum +4 Plugs for the last 20k miles and have had good results. Better throttle response, no misfires, gained 1/10 in the quarter mile at the track. No downside from what I have seen and I drive her every day plus participate in both track and drag events. Plugs show little wear after 20k and will probably continue to use them.