Carb. Power Valve:
 

Does anyone know what size power valve it takes for an autolite 2100 carb. for a 1966 F-100 with 352 engine?Where can I just buy the valve without buying a complete kit? Thanks,Russ

There is a size stamped into the old power valve if you still have it, and most performance shops have a variety of replacements.

here are a few helpful links

the size will be stamped on the edge of the power valve it will be a two digit number such as 65... which stands for 6.5 hg of Vacuum that is the most common size used

http://www.holley.com/data/TechServi...wer_valves.pdf

List: Holley Power Valves | O'Reilly Auto Parts

Thanks, everyone.I checked my old power valve and it looks like 6.5 in a circle that looks like an 8 on it??? What does that mean? Also,the old power valve does not have a shoulder on it.

Can you post a photo of it? I am hoping NumbersDummy will chime in, he will know where to get one if anyone will.... If it is a Holley manufactured part then it will be relatively easy. but if it is FOMOCO, or motorcraft, it might be a bit tougher. It might be that the Holley will fit though.. Seems to me when I rebuilt the original on my truck, that the Kit was indeed a Holley kit... I later swapped in the Edelbrock after a power build up, I couldn't see putting the old Carb on with an in effect all new engine...

after a bit of research yes you can use the Holley power valve, which is what I thought was the case...

here is a link about the rebuild process for 2150 and 2100 carbs

http://www.therangerstation.com/tech..._2150_carb.pdf

OP has a 2100 series Auto-Lite (Motorcraft) carburetor, so it's not a Holley part. Holley's were not factory installed on 1965/66 F100/350's with 352's.

COAZ-9A565-A .. Economizer (Power) Valve ~ 0-5,000 ft. (Motorcraft CE-74) / Obsolete

CARPENTER NOS OBSOLETE PARTS in Concord NC has 2 = 800-476-9653 (Note: DC listed as C0AZ, not COAZ - same church, different pew).

GREEN SALES CO. in Cincinnati OH has 12 = 800-543-4959.
---------------------------------------------------------
This exact same economizer valve comes in the carb kit = Applications: ALL 1962/74 Passenger Cars/Trucks / 1966/74 Bronco / 1969/74 Econoline.

D4AZ-9A586-A (replaced C2AZ-9A586-B) .. 2100 series Auto-Lite/Motorcraft 2V Carburetor Kit (Motorcraft CT-499-D) / Available from Ford.

MSRP: $33.42

FTE sponsor tousleyfordparts.com price: $18.38 / Tousley Ford - White Bear Lake MN

FTE sponsor horizonpartsguy.com price: $20.05 / Horizon Ford - Seattle (Tukwila) WA