[Nabush]

Originally Posted by ud03803

From some of my experience - back in 2007-2008, I had an LQ9 408 stroker 2000 SS. It had a fairly large LS1 cam with stock LS1 heads, BBK intake, big TB, headers, etc etc. my point is my curve looked similar to yours and when the tuning guy looked at my combo, he said yeah, you need heads. I had a dip from like 3500-4500. He said that when you go WOT, the velocity of the air coming in initially stalls due to the small head ports but as the engine spins up, recovers decently. I could not afford heads at the time so I ported my stock ones myself and flattened most of that curve out and gained about 25hp up top. It wasn't perfect, but opening them up helped tremendously. Good luck.

Thanks for the feedback !