This is a new Treadstone Performance product: Premium Head Flange Rolled Steel for the QR25DE:
- Qr25DE head flange fits all Qr25 engines from 02-12.
- 3D port work transitions from cylinder head port shape to 1.5' schedule 10 ID dimensions.
- CNC machined in house from 1/2' thick 1018 cold rolled steel
- Offset ports to allow for bolt clearance on top bolts