It is supplied fully assembled with springs/top caps and utilizes the original size 35.6 inlet and 30.88 exhaust valves and will handle cam lifts up to .500"

Also in this kit is a set of correct length (.220"longer) push rods C-AEG583, manifold gasket C-AHT380 plus all the head studs. Block stud kit C-AHT282 is not included but available separately

Standard S con rods Number 2 and 4 usually need modification for clearance owing to cam lobe configuration. Con rods ready to fit are available as AEG625.

Special 8 port cams with different cam lobe configurations are required. Special exhaust manifold C-AHT343 is also required.

Combustion chamber is approximately 21cc to suit sensible compression ratios on big bore engines and from January 2012 the revamped head uses stepped guides which retain the valve spring platform as per all modern day race heads.

A special set of 8 port high-lift roller rockers in correct sequence and spacings are also available as C-AHT448 for this new head.

A fully programmable injection management kit is available as C-AJJ4065

A super large 37.2mm inlet valve head for special uses and large bore engines is available to special order as C-AJJ4064RACE.

Cylinder head nut torque setting is 50ftlbs

Homologated for Classic Cooper S but not 1275GT as it was overlooked by error and only the iron head was homologated for the 1275GT