Ls3 L92 L76 255cc 64cc Aluminum Cylinder Heads Assembled Proheader on 2040-parts.com

Brand new in unopened package, going in a different direction with my build. These heads are regularly $899.00 shipped!
Hello This auction is for a new pair,(2) Pro header LS cylinder heads for LS3 LS6 LS7 L76 L72 L92 CHEVROLET ENGINES.Heads have huge rectangle
255cc intake runners and 64cc combustion chambers. These Heads are much better than stock GM heads, you will get easily 75-80hp gains or more!! These new heads castings WE CNC Machine and assemble, that is why and how we have no issues!!, bolt on performance and reliability!. Heads are Brand new and all components are brand new parts with no corners cut! We sell a lot of heads making small dollars with a lot of sales to make big dollars we want a lot of users happy!!. Please look close at all the pictures you can see we do all CNC Machine work in house!! with expert people who assemble the heads for trouble free service. Heads have all bolts holes for all stock accessory brackets, no special brackets needed, no special intakes or exhaust needed, run Stock stuff or aftermarket parts with no problems and great performance!!. These heads fit all GM blocks, All specs are listed as follows,

Chevy LS3 LS6 LS7 L72 L76 L92 255cc 64cc Assembled Aluminum Cylinder Heads



Part Type: Cylinder Heads

Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 64 cc
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc):
255 cc

CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Shape: Rectangle
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 145

Closed 115
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.165 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 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: Perimeter Bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 45 deg.
Exhaust Valve Angle: 45 deg.
Valve Guides Included: Yes
Valve Guide Material: Bronze
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:
1.600" one piece swirl polished stainless steel severe duty exhaust valves (Qualcast)
2.165" one piece swirl polished stainless steel severe duty intake valves (Qualcast)
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: LS3/L72/L92 LS7
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"
Coil Bind: 1.100"
Spring Rate (lbs./in.): 375 lbs/in
Max Lift: .680"
These heads are assembled and have 145 pounds closed seat pressure. If that is too much you can remove the inner spring and that will put you at 115 Pounds closed seat pressure which is more for a stock replacement. No beehive springs here!! We do the CNC maching and assembly. These heads are comparable to Dart world AFR speedmaster pro comp Edelbrock GM. Thanks for looking

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