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These are not for the GTA...and it uses the normal Marelli Caps...It is an 'emission control' set-up for '76 to '79 Alfetta and Spider 2 litres.
 

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Ditto Unicorn's reply in regards to emissions and later series 2 spiders. My 78 had one.

Best Regards,
John M
 

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Discussion Starter #4
well, i feel a little less ignorant now. i was hoping i was doing someone a favor . . . :eek:

now, someone please explain to me how dual points helps lower emissions :confused:
 

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The Marelli S166B serves two purposes. One is that under high load conditions, the secondary points come into play to retard the ignition timing a few degrees. This prevents knocking. As a result of this, under low and medium load conditions, the ignition timing is advanced a few degrees which can favorably effect emissions and fuel economy.
 

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Discussion Starter #6
thanks, Papajam.

i had a feeling i was something like that, but wasn't about to make assumptions.
 
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