PCV valve on a C1

[Kris Schmalenberg]

Has anyone with a dual quad setup installed a pcv valve on their motor? Im getting tired of the road draft tube. What parts are required and does it involve any carb jetting?

Thanks

[Joe L.]

Re: PCV valve on a C1

Kris-----

I can't speak from any experience whatsoever on your question. However, I can tell you that 1962 Corvettes which were California-delivered did have the PCV system. So, you might want to use the 1962 system as the "model" for a system for your car. I don't think that there was any difference between the 1962 Corvette carbs for PCV or non-PCV applications, so I don't think that any jetting change will be required for your application.

The original-style 1962 PCV valve is a very difficult piece to locate. However, since "correctness" is obviously not an issue for you, you can use a GM #6421934 valve. It is the replacement valve for the 1962 Corvette with PCV application ans it should function perfectly for you.

[Joe L.]

Re: PCV valve on a C1

Kris-----

I can't speak from any experience whatsoever on your question. However, I can tell you that 1962 Corvettes which were California-delivered did have the PCV system. So, you might want to use the 1962 system as the "model" for a system for your car. I don't think that there was any difference between the 1962 Corvette carbs for PCV or non-PCV applications, so I don't think that any jetting change will be required for your application.

The original-style 1962 PCV valve is a very difficult piece to locate. However, since "correctness" is obviously not an issue for you, you can use a GM #6421934 valve. It is the replacement valve for the 1962 Corvette with PCV application ans it should function perfectly for you.

[John H.]

Re: PCV valve on a C1

Kris -

Paragon has all the parts you need to duplicate the 1961 RPO 242 Positive Crankcase Ventilation System; see Noland's Vol.I book - p. 358 for details, p. 371 for photos.

[John H.]

Re: PCV valve on a C1

Kris -

Paragon has all the parts you need to duplicate the 1961 RPO 242 Positive Crankcase Ventilation System; see Noland's Vol.I book - p. 358 for details, p. 371 for photos.

[Jack H.]

Add-on

If memory serves, PCV was also a California option for '61 dual 4-Bbl setups.... In standard 49-state configuration the hole in the front carb's throttle plate was plugged, but that point was tapped into for PCV on the Cal emissions set-up, RPO 242....

[Jack H.]

Add-on

If memory serves, PCV was also a California option for '61 dual 4-Bbl setups.... In standard 49-state configuration the hole in the front carb's throttle plate was plugged, but that point was tapped into for PCV on the Cal emissions set-up, RPO 242....

[Joe L.]

Re: Add-on

John and Jack-----

Although the order guide may have shown the RPO 242 option for the 1961 model year, I kind of doubt that any were ever actually built. As far as I know, California law did not require PCV until the 1962 model year, and it may have only required it for cars built after January 1, 1962.

[Joe L.]

Re: Add-on

John and Jack-----

Although the order guide may have shown the RPO 242 option for the 1961 model year, I kind of doubt that any were ever actually built. As far as I know, California law did not require PCV until the 1962 model year, and it may have only required it for cars built after January 1, 1962.

[Gary Chesnut]

Re: Add-on

Lived in California during 1961 and purchased a new Corvette equipped with PCV valve. Also had 1961 409 Impala that was also equipped with a PCV valve. Gary....

[Gary Chesnut]

Re: Add-on

Lived in California during 1961 and purchased a new Corvette equipped with PCV valve. Also had 1961 409 Impala that was also equipped with a PCV valve. Gary....

[Duke W.]

Carb calibration

I don't have any data, but I suspect the carburetors were different on PCV equipped engines. The PCV system essentially acts like a "vacuum leak" which would alter fuel flow, especially in the idle and off idle circuits if not the main fuel circuit.

It's something to think about, and if the carbs were different, it should be shown in the appropriate AIMs and service manuals.

Duke

[Duke W.]

Carb calibration

I don't have any data, but I suspect the carburetors were different on PCV equipped engines. The PCV system essentially acts like a "vacuum leak" which would alter fuel flow, especially in the idle and off idle circuits if not the main fuel circuit.

It's something to think about, and if the carbs were different, it should be shown in the appropriate AIMs and service manuals.

Duke

[Joe L.]

Re: Add-on

Gary-----

I did a little further research on this one. I was incorrect on my statement earlier that California did not require crankcase emissions control devices on cars until the 1962 model year. As it turns out, the regulations requiring crankcase emissions control devices were adopted by the State of California in 1961. However, they were not effective until the beginning of the 1963 model year. So, cars sold in California for either the 1961 or the 1962 model year were not required to have PCV systems. Why Chevrolet installed them on either 1961 or 1962 models, I do not know.

[Joe L.]

Re: Add-on

Gary-----

I did a little further research on this one. I was incorrect on my statement earlier that California did not require crankcase emissions control devices on cars until the 1962 model year. As it turns out, the regulations requiring crankcase emissions control devices were adopted by the State of California in 1961. However, they were not effective until the beginning of the 1963 model year. So, cars sold in California for either the 1961 or the 1962 model year were not required to have PCV systems. Why Chevrolet installed them on either 1961 or 1962 models, I do not know.