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Original Message
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| RE: Question For Mr. F. |
| By Dave Shoe - 06/08/2001 8:48:20 AM; IP 216.243.158.49 |
Emissions laws kicked-in in 1966.
Less overlap means less fuel get's drawn straight from the intake runner out the exhaust runner, never to see a combustion cycle, thus improving emissions of unburned hydrocarbons.
Thermactor was apparently a California-only thing for hot-cammed FEs in 1966-67, but I'm not certain of this - if you know otherwise, please tell me. As Thermactor provides "auxiliary exhaust manifold combustion", it'll turn any unburned fuel or carbon monoxide into carbon dioxide - all the engineers gotta do is dial the thermactor pulley size in so it'll pump sufficient air for the task at hand.
I didn't realize Ford used two different cams in the '66 Tbird 390. This is interesting.
Another possibility is that Ford found the C6AE-R head worked better with the old cam and the new C6AE-J and C6AE-U designs worked better with the new cam. I doubt this last thought is correct, but I figure I'd toss it out, anyway.
Shoe. |
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