These GM LS6 Series Stage II heads from Patriot Performance are CNC-ported, increase the compression on a stock LS6 short block and are a great match for mild or aggressive cam profiles. Ideal for street and strip, these heads supply a good HP gains, and can handle blown or nitrous applications. Patriot Heads are made to order, and ship directly from the manufacturer, please allow around two weeks for delivery.
- A new GM raw 035 casting is used
- Precision welded combustion chambers
- Heat treated to OEM specs
- 5 axis CNC machined
- Hand detailed and assembled
- 21-4N Stainless Valves
- Bronze Guides
- Patriot Gold .650" Dual Springs
- Titanium Retainers
- 5 Angle Valve Job
- 225cc Intake Runner Volume
- Available with 59cc or 64cc chambers and/or 2.02" or 2.055" Intake Valve size. (choose below)
- NEW Bolts are included, Gaskets are not included.
- No core required!
| Part # |
IN Valve Size |
Chamber Size |
| 2029 |
2.02" |
59cc |
| 2033 |
2.055" |
59cc |
| 2013 |
2.02" |
64cc |
| 2031 |
2.055" |
64cc |
Flow Results - 1020 Superflow Bench (3.905" Bore)
| Lift |
2.02" IN (CFM) |
1.57" EX (CFM) |
| .100" |
72 |
65 |
| .200" |
140 |
124 |
| .300" |
202 |
160 |
| .400" |
244 |
196 |
| .500" |
280 |
220 |
| .550" |
291 |
226 |
| .600" |
304 |
229 |
| 
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