68 500KR s-tube

[Shelby73]

Is this the correct s-tube for a 68KR it don't seem to want to match up exactly with the breather snout. It's the one that was on it but it does not want to fit that well.

[Special Ed]

Regular cj  since KR having unique snorkel had a modified s-tube for adjustment having 3 top screw holes and 3 bottom cutouts.

[propayne]

FWIW, I believe KRs share the same S tube as the XR7-G 390 non-Hertz Cougar also.

Royce may chime in and correct me if I'm mistaken.

- Phillip

[KR500]

+1, CJ not KR. Plus PM sent

[TLea]

Just to be clear the CJ and CJ/KR use the same S tube but KR had slots/holes added. Can easily convert regular CJ to CJ/KR. Ford did actually service the KR version, had a NOS one once. Early KRs modified tubes at AO Smith

[KR500]

Just to be clear the CJ and CJ/KR use the same S tube but KR had slots/holes added. Can easily convert regular CJ to CJ/KR. Ford did actually service the KR version, had a NOS one once. Early KRs modified tubes at AO Smith

Noted in PM to OP

[Shelby73]

Do you guys have one that's correct for sale?  if not I guess I can modify mine.

[Royce Peterson]

PM me and I can supply contact info for a source of one for sale.

Do you guys have one that's correct for sale?  if not I guess I can modify mine.

[Royce Peterson]

Phillip.

I don't think so and here's why. The Shelby KR and the non - Hertz Cougar XR7-G both had snorkles extended to clear the Shelby supplied Le Mans style valve covers. The snorkle on the XR7-G was not the same as the Shelby, although similar. The first segment that bolts to the air cleaner base is different, because the 428CJ ram air cleaner base has a different hole spacing for the two fasteners than the 390GT base on the Cougar has.

The Cougar XR7-G snorkle has a 390GT lower fitting, which is a different size than the opening for a 428CJ. So both ends of the XR7-G snorkle are different than the Shelby, as well as the S tube being different.

FWIW, I believe KRs share the same S tube as the XR7-G 390 non-Hertz Cougar also.

Royce may chime in and correct me if I'm mistaken.

- Phillip

[Scott Fuller]

The Shelby drawing for the KR S-tube (three holes and three notches) shows an S8MS part number which we all know is 1968 Shelby.  What is interesting is that there is a hand written note on the drawing saying "was S8WS" which is 1968 Cougar Shelby or XR7-G.  Hmmm.

Scott

[propayne]

Thanks Royce and Scott -

Obviously, this has been something I've had trouble pinning down.

I needed an S tube for my G, and bought one from Hank Huisman at Carlisle one year after explaining to him what I was looking for.

It works, but I've wondered what exactly was used originally.

- Phillip

[Royce Peterson]

There may or may not be a  physical difference from a regular 390GT S tube. The 428CJ S tube is a different diameter at the top which would explain the difference on the Shelby drawing. I believe at the very least the notch for the screw at the bottom has to be cut in a different location because of the longer snorkle on each of these cars.

The non - Hertz X code and S code XR7-G's both used the same AO Smith / Shelby Automotive installed snorkle and S tube. I have owned originals but never bothered to measure them unfortunately.

Thanks Royce and Scott -

Obviously, this has been something I've had trouble pinning down.

I needed an S tube for my G, and bought one from Hank Huisman at Carlisle one year after explaining to him what I was looking for.

It works, but I've wondered what exactly was used originally.

- Phillip

[Scott Fuller]

Royce,

Are you saying the Cougars used the KR snorkel?

Scott

[Royce Peterson]

Yes - maybe - if they were one of the 14 (Ultra rare!) 428CJ XR7-G's.

No if they were one of the 62 X code XR7-G's or one of the 120 non - Hertz S code 390 XR7-G's. The 390 Snorkle used on the non - Hertz XR7-G's will not bolt to a 428CJ air cleaner base nor will a 428CJ S tube fit to the other end.

I have to throw the maybe in there because (so far as I know) none of the known cars has its original snorkle and S tube intact. I doubt AO Smith / Shelby would have designed a different one when they already had one that was being used on thousands of Shelby GT500KR's that would fit and function perfectly. I have seen all the known engineering drawings and I own the production planning documents for the XR7-G and there is no mention of anything regarding the 428CJ at all.

Royce,

Are you saying the Cougars used the KR snorkel?

Scott