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Sorry for the lack knowledge but I'm trying to time my 66' 6cyl. The specs say 12 degrees BTDC for automatics with a Thermactor and 6 degrees BTDC for autos without a Thermactor. What is a Thermactor and how do I know if I have one?

Thanks,

Tom
 

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That's Fords term for their emissions (smog pump) system. 66 was the first year for them and for CA only. You may or may not still have it, as a lot of them were taken off.
 

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Can't locate a good image of an installed 6cyl setup, but here is a similar system listed on eBay. It will give you a general idea of what it looks like.
 
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