I recently purchased a Holley NH carb brand new, not a rebuilt. I had heard that there was some modification that was needed on the Holley for them to perform well. Anyone know of this modification? Thanks, Bob
I have purchased two of these carburettors from langs or Synders. one is on my 1910 and the other on the 1926 Apart from altering the linkage to suit the right hand control I didn't change a thing and they work extremely well.
What modifications? I think a stock NH works fine.
I remember a few years ago it was mentioned that the fuel delivery through the float valve was drilled too small (on the repro carbs). That may not have been the exact issue but it was something was drilled too small. It used to be that what ever the issue was, Snyder's corrected them before sending them out. What ever the issue was, I'm sure it has been corrected.
I wished I had known two weeks ago that you needed an NH. You could have taken one of mine.
Call Dave a Chaffin's. A friend bought one of these a few years ago and had an issue... Dave knew exactly what it was and was able to repair it quickly. I am sure he could provide details over the phone without guessing.
I helped Bud Scudder install one of the repro NH carbs on his '16 truck. It would not stay running until we swapped out the Grose Jet for an original needle and seat from a junk NH carburetor that came from his basement. Otherwise a nice part.
Recently I've found the new rubber tipped valve needles sticking in the float valves of two NH carburetors. I dug into my old carburetor parts and found some original style steel tipped needles and put those in. Much better. They actually work.
There is always the "Poor Mans Straight Through" modification
Gary T, We got the problem solved. I was loosing power in high gear on hills. Took year old Holley apart and cleaned it well. Problem solved. Also found out why my car was cranking slow on 6 volt. I was loosing 1 whole volt across the starter switch. The started was cranking on 5.4 volt. New switch on order. Thanks for the talk you gave at our club meeting on voltage drop to starter. Bob
Losing power on hills can also be due to carb adjustment (too lean).