Well I'll talk it out with Tom sometime this week then. The springs should be fine up to .550" or .560" cam lift with that bind height @ 1.13" so I should have room to upgrade the cam lift and duration, but I only want to do the machine work once so I need these valves sized right the first time.

My horsepower goal is in the 400-600hp range. Hopefully 350-400 @ 15psi without alcohol and into the 500s with alcohol. I'm not sure if that's hopeful or not but it seems to be a reasonable goal with...
-higher compression (9.0:1) @ 15psi
-mild porting (part of tom's head work I believe)
-lump ports
-deburred combustion chambers (lessen detonation)
-port matching
-holley double pumper 600cfm 4bbl (with the hangar 18 blow through mod)
-MSD BTM or megasquirt timing control
-alcohol injection
-intercooled
-little larger ball bearing name brand turbo like this Garrett GTX3582R which is a 63mm T3 turbine turbo with similar A/R ratios and a recommended hp range of 450-750. EDIT: This actually might be a china turbo ripoff but this turbo nonetheless http://www.ebay.com/itm/GTX3582R-Turbo-c...f6d64e8&vxp=mtr

Last edited by snowman4839; 07/20/14 03:16 PM.

69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.