Billet blocks are the main reason.Damm what a Huge progression from just a couple years ago.
At the 2014 Texas Invitational the AMS GTR 3.8L Aluminum (non-Billet) motor was producing 2000HP and maxed out at 201 Trap speed winning the event quite easy. I'll stick by my HUGE progression, haha.... Yeah AMS said the block was the weak link in that combo.Billet blocks are the main reason.