Porting for stock or oversize valve BMW N57B30 head.
Includes work only, using customers head, valves and parts.
Oversize valves, guides, retainers, springs etc. can be supplied separately.
- Disassembly, cleaning and assembling
- Porting and flow measurements before / after
- Valve refacing
- Valve seat machining to head
- New valve guides on exhaust side (Intake does not typically need replacing)
- New valve seals
Flow increase over stock head is ~20% with stock valves on Intake side and ~10% on exhaust side.
Exhaust to Intake flow ratio is high and runners are kept small and efficient for good swirl and burn efficiency.
Delivery time ~2-months.
Please be in touch with email before ordering to be sure this head fits your purposes.