Took the truck to the track last night. but my times went the wrong way, and I don't know why. My previous best was
60' 2.329
1/8 10.052
1/4 15.570 @88.55
At 100k miles I changed the original plugs to NGK tr55ix
found 2 bad wires, so I went with MSD 8.5mm
Added custom tune
Cam
and Exhaust.
New times
60'2.531
1/8 10.298
1/415.753@90.58

I also seafoamed the motor at the same time as the cam swap.
I ran 265/70 16 bald a$$ firestones for the 15.57, I borrowed a set of 245/75 16's from a friend thinking the shorter tire would help my times. I'm not sure if I fouled the plugs when I seafoamed, or if I'm loosing that much traction. I couldnt hear thes tires spinning, or feel them spinning. My motor doesn't idle as well, but I figured it was the cam. the plugs were dark when I did the cam, but I don't know how to read plugs, so I didn't know what to do. I figured they're iridium, so I put them back in. I need help bad, I was looking to be in the high 14's. thanks for the help

So what do yall think? Plugs, traction or tuning probs, or a combination of two or more?