68 r runner

[roadchicken]

a friend has a 68 rr he bought new. it has something bolted to the back intake bolt on the pass side and connected to man. vac. it has a smaller vac hose that makes a loop on the end of the thing. it does not connect to any thing else. this car was built in st louis, sold in tn. its a decor group car, but did not come with exh tips. its a 4 sp car. i have a 69 rr, mine does not have this. what is it?

[440roadrunner]

Can you post a pic?

[roadchicken]

didn't have a camera with me. will try later. it was round about 1-1/4'' i dia part plastic green colored part metal,appeared to be a vac switch, but not connected to anything, but man vac. i was wondering if maybe the car was built for california?

[John Kunkel]

It's called a CAP (Cleaner Air Package) valve, it's purpose is to advance the spark during deceleration to clean up the emissions.

Many people disconnect it thinking that it affects performance but it doesn't.

[roadchicken]

john that looks simlar except for the mount. the two conn. on the end were connected with a hose and not conn to the dist. don't see how it could effect timing. were these on all 68's? i had a 68 sp sat new in 68, don't remember it having one, it was a automatic though. i thought it might be built for calif hense no exh tips. thanks for the reply.

[hotrod7043]

Actually its a NOX valve. and it probably was for CA emission cause first time i saw it was when i moved to ca.Check the emission code on body plate.Also alot of 68 383cars didnt have the tips.

[beepbeepsrule]

Regarding the exhaust tips, I seem to remember coming across a bit of info that gave me the impression that only Hemi RR's in '68 had the tips, in fact all Hemis in '68 had them. In '69 they were available on any engined RR with the proper group ordered.