Another "what carb is this?"

[yamanube]

I am slowly getting the parts needed for my build and needed a carb for my ported 61x, this oddball popped up so I scooped it up but can't seem to find any info on what it might be.
It's a modified 44, taper bored to 52mm up top with an annular discharge piece pressed in (12 hole).
From what I have read, Keith Head used to make a "big dawg" carb that was bored quite large but I cannot find any pictures and only a couple posts that lead me to believe it was an annular discharge setup. My plan is to start with jetting similar to a 44 Blackjack.

Anybody else have any insight?

 

[Yami-Rider]

Mmm, never seen a carb bored like that. Good luck on your quest.

 

[jetx]

Looks like my GRS carb...but mine only have 8 holes...I think sre also made annular discharge but the ones I have seen have a velocity stack pressed on

 

[tor*p*do]

Not a Keith Head carb; I have one in my parts box. It is not annular discharge.

 

[800750]

Bringing this one back from the dead. Any one have any idea about this carb?

 

[Big Kahuna]

GRS most likely.

 

[800750]

GRS most likely.

That was my first guess but I thought grs carbs had 8 discharge holes and this one has 12

 

[waxhead]

grs also has grs stamped on the carb