720 oil pump bleed bolt size?

[greginmadtown]

I need to bleed the oil line into a 720 engine's oil pump.

Does anyone know what size is the bolt? I'm trying to do this without taking off the carbs and having issues with seeing/feeling the bolt.

Damn sometimes I just want to pull the entire engine so I can do everything without being a pretzel and needing hands the size of baby to work on stuff!

 

[noviceskier]

8mm, that's the best picture I have on my phone, I used my phone's front facing camera in order to get with in ballpark range.
I used a 8mm deep socket with short extension held with left hand, phone with camera on right hand to get it on, then connected my ratchet and cracked it loose as oil began to drip out. A rag or two helped catch the mess.

 

[greginmadtown]

Thanks, very helpful. Love this site and the experience people are willing to share