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Originally posted by gustav
But what is your feeling on "built" 4's? It seems that, for example, the RAT engines with better cooling, nickies, external oil cooling etc etc should be able to do the job reliably, no?
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Should be able to, yes. I don't know for a fact how they hold up in DE/track day use. Then again, the claimed longevity for a street version of that motor is "only" in the ~75K mile range before the heads need freshening. To me, that says the track version will likely need service/freshening before an equivalently-built six-cylinder motor will. But that is only a WAG on my part.
For more info, you can contact Raby and have him put you in touch with a couple of his racing customers. I can think of two that I've heard of off-hand, but both were in the "maximum performance" classes where the really competitive engines are built right out on the ragged edge... Chris from Tangerine Racing (
http://www.tangerineracing.com) has used at least one Raby motor--but the one I know of had fuel problems and ran lean; bad news.
The price for building a totally-custom-built engine like that certainly rivals that of a slightly hotter than stock 911 engine.
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Of course there are always other 914 options, though frowned upon.. Like the wrx swap, and v8 conversions. 
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Most of those won't let you get on track with quite a few of the different clubs... Or will put you into the "cubic dollar" classes.
--DD