|  Also myne has ports for the air 
> pump that the DPO has put large bolts in to blank off I was 
> thinking of TIG welding them shut, any thoughts? 
> 
Adam:
        I think that TIG welding the ports shut is a bit of overkill.  I use
Allen socket plugs, available from a good supply house.  Duh, I believe the
thread is 9/16 fine, but don't quote me.  It is a standard SAE fine thread.
Once installed and the head painted, the plugs look stock.  
good luck with the project.
Kelvin. 
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