Hiya, just a little technical query. Finally getting round to sorting the blowing issues I've lived with over many years. My top man at the garage tells me he needs 6 bolts, 3 long and 3 short for block to exhaust manifold. Can anyone tell me length required. Mechanic having a bit of trouble sourcing these, yet I see quite a lot on eBay, which he doesn't use.. Thanks for any advice you can give.