99z28 5.3 vs stock 07 gt 3 valve
#4
On The Tree
Thread Starter
i guess 6300 rpm and stock valve springs on a tr224 cam not a good combo. was super pissed about it but gave me an excuse to put on LS1 heads w/dual valve springs and my old TTi 60-1 turbo kit. car is now just waiting to be tuned