Air grabbler
Active Member
What did the Clean Air package consist of on a 1967 Hemi GTX? Would the CAP package be specified on the broadcast sheet? Or did every car receive it after a certain date?
1967 Hemi GTX with CAP
- Thread starter Air grabbler
- Start date
I don't know what actually differentiates the difference, but I have seen seen Hemi GTX's with just a cap on the air cleaner nipple and no nipple on the breather cap, and ones with a hose between air cleaner nipple and the breather cap. There may be other things I'm unaware of, but that may be one difference.
It could be that the distributor had a different part number/calibration. Halifaxhops would know. I know I rebuilt a CAP listed Hemi distributor several years ago. But I don’t recall the year it was for.
pa383mopar
Active Member
I can’t speak specifically to the ‘67 Hemi, but here is a link to a pretty good article on the Clean Air Package:
https://www.curbsideclassic.com/automotive-histories/automotive-history-chryslers-cap-the-first-effective-exhaust-emission-control/
The system uses a vacuum control valve installed between manifold vacuum, carburetor ported vacuum and the distributor vacuum advance.
The article states:
“The system comprised this control valve, a carburetor with leaner and more precise calibration, and a distributor with a modified centrifugal advance curve to provide normal levels of spark advance for acceleration and cruising despite the retarded basic timing.”
“Starting in 1966, CAP became standard equipment on all Chrysler Corporation vehicles sold in California, and Chrysler even offered “UCCAP” (Used Car Clean Air Packages) at dealer parts counters, for retrofit to any 1955 or newer Chrysler vehicle.”
https://www.curbsideclassic.com/automotive-histories/automotive-history-chryslers-cap-the-first-effective-exhaust-emission-control/
The system uses a vacuum control valve installed between manifold vacuum, carburetor ported vacuum and the distributor vacuum advance.
The article states:
“The system comprised this control valve, a carburetor with leaner and more precise calibration, and a distributor with a modified centrifugal advance curve to provide normal levels of spark advance for acceleration and cruising despite the retarded basic timing.”
“Starting in 1966, CAP became standard equipment on all Chrysler Corporation vehicles sold in California, and Chrysler even offered “UCCAP” (Used Car Clean Air Packages) at dealer parts counters, for retrofit to any 1955 or newer Chrysler vehicle.”
Seen on ebay CAP carbs for 67 don't remember number. 4343s was non CAP 67 carb.
autoxcuda
Well-Known Member
Not ALL 1966 engines in California got CAP.
1966 Hemi engines did not. I have a factory announcement of CAP dated Dec 1965. Doesn't even list the 426 hemi "8 bbl". But does list a 426 4bbl.
But I think 1967 Hemi sold in California did have CAP.
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Dragon Slayer
Well-Known Member
Chrysler was able to get the 426 Hemi Exempt from CA emissions for 1966 model year. In 67 all CA cars were CAP.
For hemi it meant the 4324/4325 Carburetors and different distributor along with emission valve for 4 speed cars. The primary difference is leaner idle jet in rear carb, and distributor with 15deg mechanical distributor advance (30 at crank) with 0deg Initial timing. In 1968 all state cars were CAP required.
For hemi it meant the 4324/4325 Carburetors and different distributor along with emission valve for 4 speed cars. The primary difference is leaner idle jet in rear carb, and distributor with 15deg mechanical distributor advance (30 at crank) with 0deg Initial timing. In 1968 all state cars were CAP required.
autoxcuda
Well-Known Member
So did 67 hemi automatics get the green emission valve, but did get the different carbs and distributor?
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Don't think so 68 had them. @Dragon Slayer T/F.
gtx6970
Well-Known Member
Not sure about 67.
I have some literature around here someplace. But best I remember,,, the only thing different on St Hemis was CA sold car had a hose from air cleaner to valve cover breather.
NON CA sold cars just had a cap on the air cleaner nipple and the valve cover breather didnt have a nipple.
NON CA shown for reference.
PS, there is some argument/debate as if this breather is/was chrome, OR black
I have some literature around here someplace. But best I remember,,, the only thing different on St Hemis was CA sold car had a hose from air cleaner to valve cover breather.
NON CA sold cars just had a cap on the air cleaner nipple and the valve cover breather didnt have a nipple.
NON CA shown for reference.
PS, there is some argument/debate as if this breather is/was chrome, OR black
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autoxcuda
Well-Known Member
My CA original 66 Hemi has that black cap on the air cleaner and no nipple on valve cover.
There's an original owner 66 Bel II that runs an auto repair shop. I bet he would remember.
Dragon Slayer
Well-Known Member
Yes in CAP cars the crankcase ventilation became a closed system and the breather got a nipple to go to air cleaner so any emissions are burned through engine, either at vacuum port from PCV or through air cleaner if venting from cap. Not sure about 66 but 67 hemi/440HP was a chrome valve.
As far as distributor valve in 67 that may be both Auto/Man. I am not sure. Chrysler literature talks about it being eliminated for 68 autos. In 68/69 only 4 speed. The torque flight did not need it. Valve keeps mechanical timing in during deacceleration. Not necessary with auto.
Highest emission was at idle and deacceleration.
As far as distributor valve in 67 that may be both Auto/Man. I am not sure. Chrysler literature talks about it being eliminated for 68 autos. In 68/69 only 4 speed. The torque flight did not need it. Valve keeps mechanical timing in during deacceleration. Not necessary with auto.
Highest emission was at idle and deacceleration.
Air grabbler
Active Member
Would the CAP system be called out on the build sheet? If so, where?
A buddy has a 67 Hemi GTX and he says there is a “7” in the box for the distributor. This is odd because neither the CAP nor the non-CAP distributors end in a 7.
A buddy has a 67 Hemi GTX and he says there is a “7” in the box for the distributor. This is odd because neither the CAP nor the non-CAP distributors end in a 7.
Three years ago I bought the nipple from Bill Rolik Enterprises for $12. I can't remember where I found the information on the years which the nipple was used. I have a 67 Hemi Charger 4speed (1 of 58 made in 67).
Bill Rolik Enterprises - Contact Information
Bill Rolik Enterprises - Contact Information
Dragon Slayer
Well-Known Member
The order number in 67 for CAP was 471. CA only mandatory.
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