Cyl Head Special B30 CNC "Stage 4"

Special CNC machined cylinder head "Stage 4" Ported intake & exhaust ports and modified combustion chambers. Dual valve springs with aluminum valve retainers and special valve locks. New valve guides and new valves cut with 2 angles. Enlarged pushrod holes. Valve size and compression ratio depending on engine displacement mm. MIRA machined valve seats Addition: Lead conversion = SEK 2900 (discounted price) ===Work is carried out on the customer's own cylinder head===