ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1966 Mustang => Topic started by: fast66 on August 20, 2020, 10:55:39 AM

Title: What power valve should I have? 66 K-code auto
Post by: fast66 on August 20, 2020, 10:55:39 AM
Hi All,
required a 66 GT Fastback with a K-code recently.
I have been advised to change the power valve, but what would the number be on an original - seller of the car has several different originals? Carb is an original Autolite 4100 C6Z-F for K-code automatic...

thanks!
Claes
Title: Re: What power valve should I have? 66 K-code auto
Post by: jwc66k on August 20, 2020, 01:27:44 PM
There are 3 listed in the 60-68 Ford Car Parts (aka MPC), C0AZ-9A565-A for sea level to 5000 feet, no color listed; C0AZ-9A565-B for 5000 to 10,000 feet, color green, C3AZ-9A595-D for 10,000 to 15,000 feet, color yellow. Those three are common for a lot (yes, it is TWO words) of 4100 4V carburetors. I looked at the two in my stash, one has a tiny letter "H" on the bottom, the other is blank. These are old and any colors are lost to time.
Jim
Title: Re: What power valve should I have? 66 K-code auto
Post by: fast66 on August 21, 2020, 04:21:35 AM
Thanks Jim!
Title: Re: What power valve should I have? 66 K-code auto
Post by: evantugby on August 22, 2020, 03:04:08 PM
Quote from: fast66 on August 20, 2020, 10:55:39 AM
Hi All,
required a 66 GT Fastback with a K-code recently.
I have been advised to change the power valve, but what would the number be on an original - seller of the car has several different originals? Carb is an original Autolite 4100 C6Z-F for K-code automatic...

thanks!
Claes

Claes,
Your signature block vin shows one digit to many.  Congrats on your recent purchase.  Do you have the matching engine as verified by the engine vin stamp?
Title: Re: What power valve should I have? 66 K-code auto
Post by: fast66 on August 23, 2020, 02:48:03 PM
Hi there... avatar fixed ;-)
no, the original block was reported frozen many years ago so this is another K-code block and heads.

However - I just got info from a former owner that the crack in the frozen block was minimal and has been welded - engine is now in posession of a collector of muscle car enginges (and cars)... I have his number, let's hope fr the best :-)

//Claes