Ok thank you for your advice guys, i wont go through the effort of taking the chain covers off again then 😃
Its the original head that has been skimmed and new valves and guides fittted. When i re-assembled i fitted new rockers, and a few hydralic lifters, as well as both chains too.
The battery is a genuine GM battery, but still looks new'ish. Either its never been changed and is now 7 years old and is overdue a replacment, or the last owner got a new genuine battery for it (as it does have all vauxhall service history) I did put i multi meter across it and it read 11.8 volts, is this close enough to 12v needed or would this suggest i replace?
I might get some more meaty jump leads on it and give that a try too.
I will whip the starter out when i get home tonight and check everything over, as it wasnt fitted by me originally. Thanks again ... will keep you updated. :thumbup: