AFR heads and spark plugs
08-14-2008, 02:35 AM
#21
Le Mans Master
Member Since: Jan 2003
Location: Portland Oregon
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You are correct in that they are Autolite plugs. I posted this same info in a post earlier this week.
I ran AR3910 plugs for a while, then switched to Autilite 3823, and have run Autolite 3923 plugs for the past 2-3 years. The AR3910 are plugs from Autolite's racing line, which means they come with the "cut back ground strap" and the requisite much higher price. The Autolite 3923 plugs are essentially the same except better under higher boost conditions, but the plugs' ground strap will have to be cut back manually.
If you found an AR3923, that means that it comes with the cut back electrode and the ~$8/ea price tag.
Sorry about the confusion.
Aaron
I ran AR3910 plugs for a while, then switched to Autilite 3823, and have run Autolite 3923 plugs for the past 2-3 years. The AR3910 are plugs from Autolite's racing line, which means they come with the "cut back ground strap" and the requisite much higher price. The Autolite 3923 plugs are essentially the same except better under higher boost conditions, but the plugs' ground strap will have to be cut back manually.
If you found an AR3923, that means that it comes with the cut back electrode and the ~$8/ea price tag.
Sorry about the confusion.
Aaron
I even went as far as adjusting the valves again to make sure that the machine shop set them up correctly as this engine is built with Comp Cams CompR lifters.I am making 12 PSI of boost and I am running a 50-50 meth water mix for intercooling. Before the engine was done, it rev'd cleanly to 6500 and made 620 to the wheels at 12 PSI. Now I just want to make it to 6500 and make that 600hp pull so I can just send it home. I may have to try the Autolites to see if they help, I used NGK BKR6ES in the old engine and never had a problem, I have tried the iridium version of the same plug and that didn't help either so I went back to the standard plug.........
