i was talking to Will and Dave at the tewkesbury meet and they have used carlton gearboxes to mate to their 8valve cavalier engines but are finding them hard to get hold of,its dawned on me this morning spoddling around my local scrappy that the omegas gearbox is the same and would fit 8 and 16valve motors depending on vehicle taken from, (this would enable vauxhals 2.5 v6 to be fitted if your rich and have too much time too spare he he)