just checkin wot fuel to use in my G-plate sapphire cosworth. i was told super unleaded, optimax and BP ultima but last nite i was told by a lad that the red rocker cover engines were supposed to run on LRP. is this right. the cars previously had the headgasket done so didnt no whether the valve stem seals would have been renewed to run unleaded if this is true. pleas. any help would be great.

dave