Plug reading

Thank you for your replies.
Yes the secondary metering block has been replaced and has no power valve.
I have checked the plugs with a magnifying glass and I do not see any specs on them. I will try to get some more pictures of the plugs at a closer view tomorrow. I am glad to hear that everything seems to be close.

Thank you again for everybody's help. This is a bit of a learning curve for me. Any suggestions would be greatly appreciated.