Designed for fast road/trackday use, this ported and polished head gives maximum torque and power while still keeping all the reliability for everyday use. Giving smooth strong power and economy. Using the experience of over 25years in motorsport , the valve guides are removed, and many hours of precision fettling, port matching and shaping is carried out. This head is the most popular TBMotorsport ported head, where the inlet valve seats/throats are increased by 1mm with ports to match , and the exhaust seats/throats are bored out by 1.7mm, again with ports/throats to match. Exhaust ports matched to the (larger) Janspeed exhaust manifold and a large amount of material removed from the “strangled throats”, which gives optimum performance while still using standard valves and springs. The new guides are fitted and the seats re cut to give three angles where possible for maximum air flow. The valves are now lapped into their seats and an important amount of necessary chamber work is undertaken to prevent valve shrouding and detonation. Fully rebuilt and ready to fit. This is a top quality’TBMotorsport. Wix’ performance part and a major part of getting the best from your Cooper S! The head you see in the pictures is the actual one you will receive, not a poor copy of this! If you prefer a head with bigger valves, to a complete performance engine, just let me know. The item “BMW Mini Cooper S R53 ported and polished cylinder head top performance” is in sale since Saturday, August 8, 2020. This item is in the category “Vehicle Parts & Accessories\Car Tuning & Styling\Engine, Tuning & Chips\Performance Pistons & Rings”. The seller is “tommyredcat” and is located in Welwyn. This item can be shipped to United Kingdom.
- Brand: BMW