GRRR65GTO

Since may I think my truck has on and off made more valvetrain noise than it should. Ive already put in LS7 lifters to replace the factory ones last November and between then and May they were pretty quiet. But the noise isnt alarmingly loud but seems louder than it should. And the noise will get louder after the gets beat on (like at the track) but the next day it will be quieter again.

Specs are a Triple 12 cam (212/212 112 lsa .561 lift), LS7 lifters, comp hardened pushrods (7.4), harland sharp rockers, and upgraded valvesprings (I forget the specs but I bought them from stock48 with the cam)

Up until about a month ago I ran 7.35 pushords which gave me somewhere around .040" preload but before the first time I went to the track and I did some more reading about LS7 preload I put the 7.4s back in that I was running with the stock lifters for around .075" preload. And I dont know if that helped any

I took some videos but I dont know if you can hear anything important in them, the first one is a cold start, the second is about 10 min after the coldstart of idling, and the last two are after about 30 min of driving today.

I just dont know if this is ok or not because I know these motors are known to be noisy with a cam but that shouldnt really include tapping/knocking...

https://www.youtube.com/watch?v=PR5_...ature=youtu.be

FFDP

iTrader: (2)

Kinda sounds like the normal sewing machine noise most of these engines make.

The last part kinda put the injector tick and sewing machine noise together.

If it was mine, the sounds I heard wouldnt bother me yet.

GMCtrk

iTrader: (27)

Doesn't sound bad to me.