thanks for both replies. i dont know why i thought the a7 valve timing was different from a10s but now i know for sure. i have looked as the cheshire bsa o.c. and impressed with tech info, but dont you just wish there was more? on my a7 engine i can move the drive side roller inner race along the shaft too easy- will locktight take care of it or will i need to heat the race first? are these ngk roller bearings cheap rubbish? the list goes on.