LS1, LS2, LS6 Aftermarket Heads.

I bough these heads when I was building my engine. Yes they are great heads but I was gifted a set of AFR heads so only ran these heads for about 2 months. Gained about 25-30 hp over what the engine originally made after I put them on..Plenty of potential should you port and polish them! They're from a startup company in San Jose.. they're as cast but are machined. I switched out the rods to steel and the springs are titanium. They only have about 600 miles of use in them. Heres the description I got from the manufacturer. Paid almost 1300$ but they're just sitting in my garage so asking 800$ or best offer. I won't reply to lowballs. Part Type: Cylinder Heads Cylinder Head Style: Assembled Cylinder Head Material: Aluminum Cylinder Head Finish: Natural Combustion Chamber Volume (cc): 64 cc Intake Runner Volume (cc): Exhaust Runner Volume (cc): 210 cc (CFM Intake Runner at .600 313.6) 76 cc (CFM Exhaust at .600 168.7) Intake Port Shape: Cathedral Intake Port Location: Standard Exhaust Port Shape: Oval Exhaust Port Location: Standard Comp. Valve Job: Seat Pressures: Seat Pressure W/O Inner Spring: Yes Closed 135 Closed 105 Intake Valves Included: Yes Intake Valve Diameter (in): 2.020 in. Exhaust Valves Included: Yes Exhaust Valve Diameter (in): 1.575 in. Valve Springs Included: Yes (Double Springs up to .680 lift) Retainers Included: Yes Locks Included: Yes Valve Stem Seals Included: Yes Rocker Arm Studs Included: No Rocker Arms Included: No Rocker Arm Nuts Included: No Guideplates Included: No Valve Cover Mounting Style: gm style Accessory Bolt Holes Drilled: Yes Intake Valve Angle: 45 deg. Exhaust Valve Angle: 45 deg. Valve Guides Included: Yes Valve Guide Material: oil lite Valve Seats Machined: Yes Valve Seat Machine Style: 3-angle Valve Seat Material: Ductile iron Oiling Style: Through pushrod Machined for O-Ring: No Heat Crossover: No Quantity: Sold in Sets of Two Parts Used in Assembly as follows: * 1.575" one piece swirl polished stainless steel severe duty exhaust valves (Qualcast) .312 stems * 2.020" one piece swirl polished stainless steel severe duty intake valves (Qualcast) .312 stems * 1.320" OD X 2.235 True Double Springs (Qualcast) * New Hardened 1.300 Retainers 7° * New Hardened 312 Valve Locks * New 312 Positive Control Seals * New .015" Valve Shim * Springs, Engine: LS1 LS2 LS6 Number Of Coils: Dual Spring Damper Spring: No Overall Diameter: 1.320" OD Inside Diameter: .676" ID Spring Height: 1.800" Seat Pressure: 145 lbs @ 1.800" Open Pressure: 385 lbs * . @ 1.150"Flow @ 28" H20 Lift Intake Exhaust .200 144 109 .300 202 154 .400 254 187 .500 290 205 .600 313 214 Coil Bind: 1.100" Spring Rate (lbs./in.): 375 lbs/in Max Lift: .680"

Condition

Used (normal wear)

Brand

GM