Originally Posted by ScOoTeR
If you're taking it to a reputable builder, tell him to make it run on midgrade - premium if you can afford it. He will know what to do with machining, but you really can't just go by "milling the heads" - your piston shape, deck height and combustion chamber will all need to work together to run well.
Talk to your builder and listen to him.
Alright thanks. How much Hp difference would setting it for mid grade make than setting in for 93 make?