ShroomTat4yaHed

I have an lt1/4 swap. Just had alot of tunes done today. Attired it ran like a beast, still does. Only thing is I missed 4th going down the highway and over reved. About 10 miles later I noticed a bad ticking sound. Not at an idle though. It only does it when I'm at an average accel, more gas, the sound goes away, decelerating it does the same. Took the valve covers off because I couldn't determine which side it was coming from and found nothing. Sounds enternal. Any ideas?