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Message: [QUOTE="backwoodsboy, post: 620382, member: 5415"] I'm assuming you're referring to the old IDI 7.3 engines? For one there are In-Direct-Injected (IDI) so fuel delivery isn't as controllable. Second there are naturally aspirated, or turbo-charged but in limited boost applications. Little/no boost=less viable air for combustion=less fuel can be delivered (or at least burned effectively). Being In-Direct-Injected they also have a pre-chamber for combustion, which is restrictive and doesn't lend itself to performance applications. Don't have a ton of knowledge on the IDI platform, but that it what comes to mind off the bat. [/QUOTE]

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