The SneedSpeed Super Cooper series of cylinder heads is our premier fully assembled MINI Cooper cylinder head. Each head is cleaned, checked and then built into a Super Cooper Street, Sport or Super head by our inhouse engine machinist. Street are stock replacement heads that are fully rebuilt to better than OEM Specs with OEM parts. Sport heads receive all the above plus a Sneed high performance cam and new high performance valve springs. Race heads receive everything above, cleaned valve bowls, swirl porting and polishing, a Sneed high performance cam, 1.5mm oversized super alloy valves, race valve springs with titanium retainers. So pick your poison, you wont be disappointed with the results.!!

Link: http://www.sneed4speed.com/mini-s-r53-cylinder-head/