A short while ago I was contacted by a reader of the site in Denmark . Rasmus sent me a series of pictures of an unusual 8 port cylinder head the likes of which I had never seen before, I put up questions here and on a couple of other web sites asking for information and after a few false starts I am very pleased to be able to relate the full story.
I am very pleased to be able to tell the full story of the Allen / Pinion 8 port cylinder head.
The head was originally designed by Gordon Allen, the man famous for his cranks, this work was done in the late 60's or early 70's. He failed to get his prototype working properly as he considered the inlet ports to be too small and sold the patterns and rights to two Brothers who were originally from New Zeland called Colin & Charles Pinion.
In 1973, the Pinion brothers had approximately 10 heads cast up in the Rover casting shop on a Saturday morning, as a job on the side.
They then proceeded to get their original prototype working correctly. I believe that a car fitted with their head was to break the lap record for Special Saloons at Brands Hatch in 1973. There is very good reason to believe that your head is this actual cylinderhead used on this car, as the water manifold in your pictures is identical to this unit. It was aparently made as a unique 1 off!
The brothers advertised this head in some of the 1973 editions of Autosport, a copy of which is attatched. Due to continuing production problems the brothers later lost interest and sold the patterns and rights again. The design was taken on by another company, but once again this attempt failed to produce the good.
I have heard of 3 people who are using these heads and the results are excellent when the setup is working correctly.