1968 Thermactor Pump

[stangfan]

My GT/CS was built mid-March for the San Francisco area. It has the hose running from the oil breather to the air cleaner and a PCV valve on the right side valve cover. It is a C code 2v 289. Would it have come from the factory with a Thermactor or smog pump?

Thanks. :grin:

 

[CougarCJ]

Only if it originally came with a manual transmission.

I see that you are in Canada. From what I have read, Canadian DSO cars normally did not get shipped with the emissions. 1968 289/302 cars still had the open emissions systems. That is why most Canadian sold cars look like they have 1967 air cleaners.

 

[GT/CS S Code]

Actually ...

Actually, Steve's car was originally sold in California and then imported into Canada years later. It isn't a Canadian DSO car, so it likely started out with the emissions controls installed ...

 

[somethingspecial]

Only if it originally came with a manual transmission.

I have not seen an Automatic equipped car with a smog pump. Scott would know this better than I as seen in the post above. I think you are safe in your restoration without a smog pump.

 

[CougarCJ]

I have not seen an Automatic equipped car with a smog pump. Scott would know this better than I as seen in the post above. I think you are safe in your restoration without a smog pump.

For 1968 in the USA, the basic rules were:

• IMCO with an Autolite carburetor and automatic transmissions
• Thermactor with any manual transmission
• Thermactor with a factory installed Holley carburetor - regardless of transmission

 

[somethingspecial]

I stand corrected, Thank you Scott. What does the IMCO system look like?

 

[stangfan]

Thanks for the input guys. After I posted, I looked it up in the GT/CS book. The information indicated that the Thermactor would be installed in any manual transmission car and any automatic car with a performance engine. Mine definitely would not have had one.

 

[CougarCJ]

I stand corrected, Thank you Scott. What does the IMCO system look like?

Improved Combustion

 

[dalorzo_f]

IMCO was detuned to meet emissions without the smog tubes, etc. by using a different carb, timing, etc.

"The IMCO system uses thermostatically controlled, heated-air induction systems, dual diaphragm vacuum advance distributors, anti-dieseling throttle-stop solenoids, a distributer modulation system, a transmission-regulated spark system, and a spark Delay system. The Thermactor system uses a belt-driven pump to force air into each exhaust port behind the exhaust valve to help burn excess unburned hydrocarbons before they reach the atmosphere." (courtesy of http://www.428cobrajet.com/id-smog)

So IMCO looks like a carb and engine... :wink: