Bob Gaines

Yes , I have seen the 67 Shelby York compressor and the 68 York compressor side by side the regular Mustang version. The color had to do with easier identification of the compressors for assemblyline workers I believe given that the small engineering number on the tag would be harder to read. My expertise on compressors internals is lacking because I must be over looking some minor difference between the 67and 68 Shelby vs regular Mustang compressor . Ford would not go to all the trouble plus the added expense to identify the compressor differently and change the engineering number if there was not some kind of difference. The 69/70 Shelby used the same cast iron Tecumseh compressor with same engineering number as the regular Mustang. The cast iron Tecumseh compressor was commonly used at the Dearborn plant then.

Since we are in the weeds we might as well go farther.The 67 and 68 Shelby's used a different compressor as proved by a different engineering number from the Mustang on the compressor tag . C7ZX prefix for 67 and C8ZX prefix for 68. The ZX portion indicated something special and was used extensively on Shelby unique items . Ford was in the habit of changing engineering numbers for any small change . Ford was NOT in the habit of spending money frivolously on unnecessary design changes if they could save even a penny. In 67 for example Shelby production was held up on air conditioning cars for a time until the different compressors could be replaced.They came from Ford with regular compressors and those few were put to the side and replaced at Shelby American. subsequent builds got the updated compressor on the Ford line before going to Shelby American. As far as what is different mechanically in them you got me there . That design expertise is apparently above my pay grade because I have not been able to tell from examining them. I would not bet my life however that there was not a change making them unique given Fords past M.O. in that area. The 69/70 Shelby compressor (351 auto/4speed and 428 auto only) on the other hand carries the same engineering number on the compressor tag as the regular Mustang.

i agree it is interesting on some CJ four speed models not being able to readily have A/C as a option. FYI 67 and 68 Shelby's used a special Shelby unique A/C compressors apparently for the high RPM running. Yes there were 68 GT500 KR (CJ) 4 speed with factory A/C. On 69/70 Shelby's the compressor was standard Mustang. For 69 I understand that there were only a small few CJ 4 speed A/C Mustangs (according to Kevin Marti's records) and no 69/70 Shelby's.

Even though I didn't sense any malicious intent from the context of your previous post the gracious way you conceded correction of the information should show others that it was just a honest misunderstanding.

Thank you for the welcome. Yes I have been around Shelby's for a long time now. Yes I know Jim and Craig . They are friends . I read a post on the SAAC forum where they quoted someone here perpetuating the urban myth about 68 Shelby's with 427's . It was a version of the myth that I hadn't heard before . I wanted to read it and the context for myself .

I knew Wayne and I am familiar with many of his wonderful cars. Waynes cars were driver quality cars (nothing wrong with that) and where not yard sticks for originality. You are mis informed that you think his Black KR convert came with the 427 from the factory or swaped at the factory ,dealer installed or what ever . It was owner added..