Thanks Aiden, yes that is how i torqued it altho the bolts werent replaced. Can you confirm this has the small bolts around the chain area on the head.
Alan you may have a point but it had been run for the 25 mins first and it did a fairly big hill a good bit before the bang and with it being a auto it does get a good rev before it gets going. The engine appeared spot on right until it went bang. It did still run with just a slight misfire after but gaskett had cooked all over. If i was to number the bolts starting at cylinder 1 the first 3 on the left stripped and the last 3 on the right excluding the end one which stayed tight and also another third from the end on the left. Altogether 7 out of 14 lifted some as much as 5mm!!!

thanks for the help, Brad