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Original Message
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| One thing I've learned about Thermactor... |
| By Dave Shoe - 06/23/2003 7:06:23 PM; IP 12.2.11.131 |
...is it was an option on any FE from 1966-on.
Thermactor was mandatory on California FEs sporting the large-overlap GT/PI cam in 1966-67, and in 1968 the whole country got in on the act, making Thermactor a requirement on all 1968 390GT engines.
To keep car prices down and profits up, Ford deleted the GT cam option from the 390 in 1969, thus Thermactor was not mandatory on the 390 in 1969. The Holley was replaced with the less costly Autolite carb, as well.
For $46.00 I doubt you had too many takers of Thermactor as an option, however I suspect some cities or counties in California or New York might have mandated Thermactor, even on mild cammed FE engines with 2-barrel carbs. These places were probably under pressure from the EPA to clean up their act or face fines, and all new cars sold within the most polluted counties may have gotten the extra pollution controls.
Of course, I'm just guessing at this, but it puts logic to the fact that some 390-2V engines came with Thermactor.
Also, IMCO is basically a car without specific emissions controls added. IMCO simply recalibrates the carb and distributor to burn leaner than in earlier years, whereas Thermactor adds an exhaust gas reactor that allows the carbs to be factory-jetted richer.
Shoe. |
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