Sorry, did a search and found only a possible result of a bent valve. Hopefully not.

Ive had toda b cams in my b16, Toda valvesprings, retainers, gears and stock bottom, over a year. Running great, but not tuned although i have adjusted the cam gears at the most of +3/-2.

Recently i noticed my vafc is showing +0.00 pressure for the cm2/kg when i hit about 8300 rpms and higher. its always been negative pressure. I got my throttle body bored over a month ago and got a new tps and set it to spec.

If i remember it didnt show +0.00 pressure with 0, 0 on the cam gears. But it has been showing +0.00 with +2 -1 and +3 +1 on the cam gears.

What do you think?? Hopefully Vafc not calibrated?
Bent Valve? which i really dont know how.
Anyone have this with no bent valves??
Could the bored TB have anything to do with it??

thanks