Upgrade your B18 head with B20 valves. Smaller valve stem diameter improves air flow.
B20 valve seals for improved oil seal.
Flow test indicates a theoretial increase of 5 HP
|419650||Conversion valve guide intake B18 to B20||4|
|419643||Valve lock B20/B30/B19/B21/B23/B230||16|
|1306630||Valve steam seal B20/B21/B23/B30 69-||8|
Valve spring retainer B20/B30
|419640||Exhaust valve B20A/B/D/B30A 35mm||4|
|419629||Intake valve B18 for B20 guide, 40mm||4|
|418737||Valve spring B18/B20/B30E/F||8|
|419651||Conversion valve guide exh. B18 to B20||4|