Got this carb body with a bunch of other stuff, thought it was a NH but things aren't always what they seem. The throats are larger just over 1-1/8" standard NH is 1-1/6" also you can see a lot of daylight when looking through the carb and the throttle arm is different.
The nameplate has been replaced with just a metal tab and two very large steel rivets as has the float hinge.
I've tried the float and bowl from a known Nh carb and they seem to fit ok. Could this be one of the straight through NH carbs I have heard about?
Hello It looks like a straight through NH
Nice find it does appear to be a straight through carb. I have no personal experience with them but I understand they are sought after. The only thing I've read negative about them is they use more fuel but I could be wrong.
I have found that all "straight bore" NH Holley carburetors were originally supplied (unless toyed with or repaired otherwise) with both cast throttle & choke lever arms - easy to spot.
Hard to verify from your above photo - perhaps another photo being not so close up would help identify it - from the first photo, the body seems to indicate a dip - a straight through has a more definite "straight taper" from both ends to the center.
Straight through NH's could net you a slight lag off idle if you "punch it". Still flow more than the swaybacks. 31cfm over 29cfm I think were the numbers.
There is probably a hole under that plate where a brass screw threaded in. The roadster I bought from Art Simpson had a straight through on it. Fast. But with 3:1 gears the sweet spot was faster than I wanted to cruise. Bought a new swayback. James, you will have people beating the door down for that.
The throttle arm is stamped steel not cast and it adjusts from the carb not the arm the choke arm is mia. here are more pics. Jim
Whatever it is - it takes the early style bowl with the drain attached to the bowl - not the center drain type as the bottom of the body has no "reliefs" for the center drain.
If you look where the needle valve comes through in your picture it looks like it dips down I would say no it is not a straight through NH carburetor here's a photo of a straight through