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I am rebuilding an 8RT carb that I picked up on eBay. It looked pretty good and still had the tag so I figured it wasn’t too worn out. It has a lot of play in the throttle shaft, a 0.281 door pin slides in pretty easily so I have a new base on the way. I have been practicing the chromate dip on a junk air horn and have it down pretty good. It was a little darker than I wanted so I will adjust the time slightly on the real one.
The fuel inlet nut gets a little tight at the bottom. Before I run a thread repair in there I wanted to confirm the thread size. Are all 8RT air horns 1/2-20 threads?
I looked at a NOS carb body last night and I think it needs to be a little darker, not lighter.
I soaked the carb body in Berryman removing all varnish and oil buildup. Then I soaked in an ultrasonic cleaner with water/pine sol. Now that the castings are clean, media clean with soda and then lots of compressed air and hot soapy water to remove residue.
Plate with copy cad from Caswell moving the parts occasionally to avoid shadows, especially on the air horn. Rinse and go straight into chromate. I usually hit the freshly plated part with a hair dryer.
I have been experimenting with the chromate dip. With the caswell dip, it was either too light or too dark/bronze. I cleaned the bodies with soda, ran through the dishwasher, and plated another thin coat of zinc and dipped them in my own homemade dip.
I bought some Sodium dichromate, added 10oz and about an oz of sulfuric acid to a gallon of distilled water, dipped twice for about 10 seconds and color was perfect. Pretty close to the finish on a NOS base I have for comparison.
All of my small parts are plated and ready for assembly. The black oxide dip for the base should be here tomorrow.
I don’t know why, but rebuilding these Holley 94’s is my favorite part of the hobby. Every time I try to do it a little better. This time I took the time to plate everything and clean the throttle body cavities with the drill sizes mentioned in the manual. I added a new throttle shaft with absolutely no play and can barely see daylight around the throttle plates. Excited to see how this one runs.
I am in the process of converting an oil bath air cleaner to a K&N filter, going to install it once I get finished.
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