Page "MG MGA" Paragraph 11

A high-performance Twin-Cam model was added for 1958.

It used a high compression ( 9. 9: 1 later 8. 3: 1 ) DOHC aluminium cylinder head version of the B-Series engine producing.

Due to detonation problems, a low-compression version was introduced later.

Four-wheel disc brakes by Dunlop were fitted, along with Dunlop peg drive knock-off steel wheels similar to wheels used on racing Jaguars, unique to the Twin-Cam.

These wheels and chassis upgrades were used on a small number of " DeLuxe MGA 1600 Roadsters " built after Twin-Cam production came to a halt.

Aside from the wheels, the only outside identifier was a " Twin-Cam " logo near the vent aside the bonnet.