spark plug help!
 

i have a scott shaffiroff 406 sbc with brodix track 1 heads i am running autolite 3932 plugs are these correct!! i am having a miss above 5500 rpm. i am also running 38 degrees timing. thanks for any help!!

Re: spark plug help!
 

They should work or a 3910 miss above 5500 normally a plug missed all the way. Have you pulled them to make sure they look good ?

i have pulled them they are very sutty black! thats just from a idle not wide open throttle. i looked at them today after its been sitting for a week and they look like they have gathered moisture and a small sighn of rust! is that normal for one that has been sitting for a week without being started?

If this is not a NOS engine those plugs are waayy to cold. I use AR3933 plugs with 700 hp of nos, you need to go up a couple of heat ranges.