CNC porting for stock or oversize valve Cosworth YB head.
Includes work only, using customers head, valves and parts.
Oversize valves, guides, titanium retainers etc. can be supplied separately.
Price includes CNC porting, valve refacing, seat work, re-surfacing and cylinder head measurements.
Flow increase over stock head is ~25% in smallest runner version and with stock valves.
Cross section area and flow can support ~260hp naturally aspirated and will support ~8000rpm with stock displacement.
Exhaust to Intake flow ratio is high and runners are kept small and efficient for good pulse tuning and fast turbo spooling.
For stroker builds, or more RPM we will adjust cross section area to meet requirements, or machine seats for bigger valves without additional cost.
Every cylinder head is hand finished.
Delivery time ~2-months.
Please be in touch with email before ordering to be sure this head fits your purposes.