here are the specs on the heads taken directly from summit.
i ordered all the parts from summitracing.com and paid the corvette shop to put it together that was the 5k.(he supplied the exhaust headers back)



Cylinder Head Style Assembled
Cylinder Head Material Cast iron
Cylinder Head Finish Natural
Combustion Chamber Volume (cc) 64
CNC-Machined Combustion Chamber No
Intake Runner Volume (cc) 170cc
CNC-Machined Intake Runner No
CNC-Machined Exhaust Runner No
Intake Port Location Standard
Exhaust Port Shape Square
Exhaust Port Location Standard
Spark Plug Style Straight
Intake Valves Included Yes
Intake Valve Diameter (in) 1.940 in.
Exhaust Valves Included Yes
Exhaust Valve Diameter (in) 1.500 in.
Valve Springs Included Yes
Outside Diameter of Outer Spring (in) 1.250 in.
Damper Spring Included No
Number of Springs Per Valve Single
Retainers Included Yes
Retainer Material Steel
Locks Included Yes
Lock Style 7 degree
Valve Stem Seals Included Yes
Valve Stem Seal Style Umbrella
Rocker Arm Studs Included Yes
Rocker Arm Nut Thread Size 3/8-24 in.
Rocker Arms Included No
Rocker Arm Nuts Included No
Guideplates Included No
Accessory Bolt Holes Drilled Yes
Valve Guides Included Yes
Valve Guide Material Bronze
Valve Seats Machined No
Valve Seat Material Steel
Steam Holes Drilled No
Oiling Style Through pushrod
Machined for O-Ring No
Heat Crossover No
Quantity Sold individually.
Notes Requires Vortec-style intake manifold for installation.