NPS - ported LSx CNC heads

LS6 CNC

These NPS-ported LS6 CNC heads have stock 2.00"/1.55" valves with multi angle intake and radius exhaust seats for good flow and performance characteristic.
While these heads accept 2.02"/1.575" valves, stock valves are capable of flowing enough to support close to 600 horse power and are not as picky for cam profiles.
Runners are CNC ported for equal flow between from port to port and to maintain perfect air velocity through runners. Combustion chambers are polished to maintain good pressure recovery and flow dynamics and to keep compression ratio high without making deck surfaces thinner.

Stock Flow                                                        Ported Flow

cfm@28" h2o

cfm@28" h2o Dif. to Stock %
Lift " Intake Exhaust E/I % Theor HP Lift " Intake Exhaust E/I % Theor HP In Ex
0.1 62.2 54.2 87.1 128 0.1 64.9 53.1 81.8 133 4.3 -2.0
0.2 134.4 102.6 76.3 276 0.2 132.0 106.0 80.3 271 -1.8 3.4
0.3 191.1 131.4 68.8 393 0.3 200.3 147.6 73.7 412 4.9 12.3
0.4 230.4 153.0 66.4 474 0.4 252.4 178.0 70.5 519 9.6 16.3
0.5 252.4 165.1 65.4 519 0.5 285.3 194.1 68.0 587 13.0 17.6
0.6 247.8 173.5 70.0 510 0.6 303.1 203.0 67.0 623 22.3 17.0
0.7 248.1 510 0.7 296.0 208.4 70.4 609 19.3
0.8 301.4 211.8 70.3 620

 

LS6 intake runners LS6 exhaust runners LS6 combustion chambers LS6 intake runner LS6 exhaust runner LS6 combustion chamber 346cid-LS1, LS6 intake, Tube headers, Full exhaust with Cats, ported TB, Bauer Racing custom cam (smog legal) 470hp/593NM 346cid-LS1, LS6 intake, Tube headers, Full exhaust Cats removed, ported TB, Bauer Racing custom cam (smog legal)

 

LS1 CNC

These NPS-ported LS1 CNC heads have stock 2.00"/1.55" valves with multi angle intake and radius exhaust seats for good flow and performance characteristic.
These heads accept 2.02"/1.575" valves, but with stock valves are capable of flowing enough to support around 550hp.
Intake ports are CNC ported due excessive port re-shaping. Combustion chambers are polished to maintain good pressure recovery and flow dynamics and to keep compression ratio high without making deck surfaces thinner. Exhaust runners are hand ported.

Stock Flow                                                         Ported Flow

cfm@28" h2o cfm@28" h2o Dif. to Stock %
Lift " Intake Exhaust E/I % Theor HP Lift " Intake Exhaust E/I % Theor HP In Ex
0.1 62.0 48.2 77.6 128 0.1 65.4 53.5 81.8 134 5.3 11.1
0.2 133.1 92.8 69.7 274 0.2 138.5 104.2 75.2 285 4.1 12.3
0.3 189.6 131.0 69.1 390 0.3 203.7 140.6 69.0 419 7.5 7.4
0.4 222.3 156.0 70.2 457 0.4 244.3 174.2 71.3 502 9.9 11.7
0.5 222.5 170.7 76.7 457 0.5 264.3 192.5 72.9 543 18.8 12.8
0.6 230.6 181.0 78.5 474 0.6 276.8 198.5 71.7 569 20.0 9.7
0.7 233.7 182.9 78.3 481 0.7 286.2 202.2 70.7 588 22.4 10.5
0.8 295.0 607

 

LS1 combustion chamber LS1 intake runner LS1 exhaust runner