Went on vacation, split w/wife of 26 years, work, Working on truck, Brought the truck to Thunder Racing for tune,the guy drilled the throttle body instead of setting the IAC,changed the injectors to 44#, made 301 HP. At 6000-6200 RPM HP fell like a ton of lead.He said it was due to 1.75 Rocker Ratio w/ too agressive ramp profile on the cam. He said the vgalve was closing too fast and bouncing off the seat,he recommended putting the stock rockers and lifters back in. Anybody got any thoughts suggestions

 

Ill be down friday -- we will go fishing --- take ya mind off that ****



Dude that sucks yea. Sorry to hear about ya split

 

Man I wish I could but I go on the boat tomorrow for 28 days

 

That sucks --- I was down there about a month ago fishing and we slaughtered the specks,

I was looking for your truck when I was down Golden Medow but never saw it


What kind of boat you work on? Im on a drilling rig right now (inland barge)

 

wow, sorry to hear about the run of luck there.

as for Thunder Racing... I'll leave my comments off the board

 

Appreciate the the kind words, any thoughts on the truck

 

sorry, as for the truck:
*try putting your stock rocker arms back on and see what you have. I don't see the cam being "too aggressive". I don't know anyone running aftermarket rocker arms.
*I have no idea about the lifters, everyone on this board AFAIK uses GM original lifters with no problems, but swapping those is a bit of work so try the rocker arms first and save lifters for a last resort.
*Drilling the throttle body hole is cheating and compensating for a lack of effort when tuning. I know for a fact that cam will idle just fine in a 5.3L just fine, just ask Jarod, I threw a basic tune in his truck and had it idling "ok", and I think he and Jeff (from Oklahoma) and Ross fine tuned it more later.

How does it idle? How is it just driving around town? Does the valvetrain make excessive noise?

 

The valve train is pretty noisy and it's showing that it's pulling timing'Jeff said it might be due to the knock sensors picking up the valve train noise I did adjust the throttle blade some and it is idling better.I started looking at and re adjusting the ve table and it was way off.