SK race carbs
- AirFuelSpark
- Nov 3
- 3 min read
So to explain what these are as invariably a bunch of people will decide to throw their opinions around without much back info.
Before someone says “oh those are 660s!”
They are not. These are from 67-68.
Center squirters were not available until later 69 (I believe).
These are the second evolution of the center squirter. The first hand made ones I have seen are from 1965.
In the 1960s (and before) Ford and Holley were very intertwined.
Just about any performance Ford came with a highly specific Holley.
This did not just stop at production cars.
Several guys from Holley had offices at Ford.
When Ford’s racing effort required such, they would ask for spec carbs. Race teams and others could do the same.
In the late 60s Ford was still allowed to use 2x4 setups in Nascar.
These carbs came from that effort.
In this case these two carbs came to me via carb man Blake.
He worked for Mr Yates before starting his carb company. He was not really sure what these were when I first met him. When I saw them I had a pretty good idea what they were but wanted to research some.
Next time I was in Charlotte I explained what I found out about them.
He explained he bought them in the 1980s from Len Wood.
These carbs have a tag from Riverside, so that seems self explanatory.
Of course over the years I have bought dozens of these carbs and tried to make sets. Normally I would just find singles and have to make some small changes to make them a functioning pair.
These two carbs came from Ford AC/AD carb stock. Original AC/AD List 4201/4202 were otc race carbs sold on Tunnelwedge intakes.
These were Vacuum secondary carbs rated at 652cfm each. Ford must have known their intake had far too massive runners and plenum so they used these carbs with bellboosters to help aid in responsiveness.
These carbs were originally race only with no power valves. They are actually very effective on this intake and a 427.
The Holley team at Ford would have grabbed these off the line and altered them as needed per order.
In this case the vacuum secondary parts were not used and the carburetors were modified to become center squirters with mechanical secondaries.
Often even in sets you will see different staging for the butterflies most likely determined by usage and the race track. None of the parts typically match either, I suspect they just grabbed a pile of metering blocks and just altered them, likely easier than interrupting an assembly line to make one off stuff.
Things to know…. Just because they are custom race carbs does not mean they are “better.”
Most are highly specific to an application and will need some attention to work well on a different application.
I don’t really sell these for a lot, but I am very interested in vetting the owner.
I like these to only go to historical race cars. It is one of those “Drew is weird about this stuff” situations. I absolutely 100% of the time will focus on a cool car having the correct carbs vs making a larger profit.
In the scenario here, John asked me for a set. He patiently waited for me to get around to them.
This set is going to Bill Clawson’s Mustang.
Read about it here:
I absolutely think this is the right car for a set like this. Read up on a car, is a neat piece with a great history. I hope these work reallt well for them.
