Fordnatics List Archive

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Mail From: (email redacted) (Doug Bailey)




The Cobra's motor is a 289. The induction and exhaust systems
are non-standard and the compression is now 10:1.

Question: Can I take the point gap and dwell from the book, or
do I need to experiment and/or do math now that the motor has
been modified? What about setting up vacuum advance and retard?

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Mail From: "Fontana Peter" <(email redacted)>

> Can I take the point gap and dwell from the book, or
> do I need to experiment and/or do math now that the motor has
> been modified?
No - take the stock numbers. Then, as soon as you save another $75 or so,
convert to electronic. If you have single points, you won't get the spark
quality you need at higher revs (5000+). If you have dual points, sell it to
someone who needs it for originality purposes - you can probably pay for most
of an electronic unit with what you get for a dual point.

> What about setting up vacuum advance and retard?
That is a tuning item. Tell us your cam choice (apologies if you already
did), and we'll see if someone have a good suggestion. In all cases, pining
defines the upper boundary with your compression ratio.