Quote:
Originally posted by eapcpa
Michael,
I am unfamiliar with the thread about twin plug mod and plugging the holes until you are ready. When the time comes, you will need to pull the heads and raise compression or twin plugs will not give much benefit? I don't understand the logic. If you have high compression you need twin plugs now. If you are running 9.8:1 or less why would you go to all of the expense to twin plug. And I can tell you for a fact that it ain't cheap. Just wondwering.
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I disagree, at least on 2 liter heads. You can add the extra hole and go twin plug later with noticable performance effect. The key is dyno tuning the ignition curve after going from single to twin plugs. You can get much more aggressive with the ignition curve on twin plugs, extracting extra performance, even on a motor that is 9.5:1. Just ask Fritz Ficke, who went from single to twin plugs on his stock '67S; he says the difference is night and day. Whenever you increase combustive efficiency there is a gain to be had by (afterward) safely adjusting your curve.