3k Bigport Or Standard?

[harun]

Wondering if anyone has a picture of the welsch plug at the back of a 3K bigport head?

I have a big round circle at the back of my 3k head however i cannot tell if it a welsch plug and it is much bigger then the welsch plugs found on the side of the engine.

 

Thanks in advance

[Xany]

That sounds like one. If it doesnt have a metal plate there it should be a bigport. From memory i think the welsh plug is about 40-50mm across.