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Original Message
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| The Mustang was available with the GT option in 69 |
| By Dave Shoe - 02/18/2003 9:24:20 AM; IP 216.243.176.34 |
The Mustang GT was still available as an option in 1969, but the 390GT engine had been obsoleted due to the excessive cost of the GT engine.
Since the 428CJ was now available, there was no longer any need to sell the expensive Thermactor emissions package on the "second tier" engine. Removing Thermactor necessitated the removal of the GT camshaft, because the high lobe overlap allowed some raw fuel to spill directly from the intake valve out the exhaust, necessitating an exhaust gas reactor to meet the more stringent emissions requirements of 1968.
Note that in 1966-67 only California 390GT engines required Thermactor, but in 1968 all US 390GT engines required Thermactor.
To further the economization of the 390GT engine for 1969, the Holley was removed in favor of a lower cost Autolite carb.
The 390IP was necessary to make the 390 engine competitive in price with 2nd tier performance offerings from the other car makers.
JMO,
Shoe. |
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