Remi..are the deals from Indy directly? I've heard of WAY TOO MANY horror stories dealing with them! I believe Dwayne's a distributor for them,though. I'll see what he says!....Chad,I'm sure opening up the ports will take some velocity away..i.e TORQUE! But..maybe the milling will help to offset some of the torque loss. I'll have to discuss this with Dwayne,as well! All I know is if getting the heads ported,and raising the compression to what HE thinks will handle pump premium...results in CONSISTENT 10.9-11.0's....I'll be VERY HAPPY!