i found these heads on tech. how much would i gain over my stock 317s and what would the compression ratio be with a stock mls lq4 head gasket???




# 2007
LS1 Stage II Perimeter Bolt Assy

Brand: Patriot Performance
Product Line: Patriot Performance GM LS Series Stage II Cylinder Heads
Part Type: Cylinder Heads
Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 67
CNC Machined Combustion Chamber: Yes
Intake Runner Volume (cc): 213cc
Exhaust Runner Volume (cc): 78cc
CNC Machined Intake Runner: Yes
CNC Machined Exhaust Runner: Yes
Intake Port Location: Standard
Exhaust Port Location: Standard
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.020 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.570 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.650 in.
Damper Spring Included: Yes
Number of Springs Per Valve: Dual
Retainers Included: Yes
Retainer Material: Titanium
Locks Included: Yes
Lock Style: 10 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: PC seal
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
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-angle
Valve Seat Material: Steel
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold as a pair.

 

They will not work for you, they have the perimeter style head bolts for a 97-98 LS1 block.

 

hahaha good call!

 

You would just have to change your valve covers to the old style.