Index > CNC Ported Heads > Subaru EJ25 B25

2004-06 Subaru STI EJ25, B25 Casting, Single AVCS

CNC Ported Heads

Perfect for 400+ whp Builds!

After 25+ years of Hand Porting Heads we are now Digitizing our Head Designs and CNC Porting them in-house in our Rottler P69AHD 5 axis cnc head porting machine. Port sizes can be sized to match your HP levels.

Service Includes:
Precision CNC Porting Customer Supplied EJ25 Cylinder Heads.

Head Castings Identification:
2004-06 Subaru STI EJ25, B25 Casting, Single AVCS

* This service does NOT include Head Casting, Disassembly or Assembly, Precision Multi-Angle Valve Job, or Resurfacing. This is for the Porting Service Only. All other machine work is extra charge.

* Please note, It's not uncommon to see certain parts of the ports that are not machined. This is because with most of our port designs we try to keep port velocity to a maximum, It's not always about how big the port is, or maximum flow numbers. This almost always helps with low to midrange HP and Torque numbers without sacrificing top end.