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i will maintain that you cannot use a cowl hood on a 4th or 5th gen because of the rake of the windshield. the ferrari is a good example - the older windshields of the 60s were practically perpendicular to the road surface and created a pocket of cold air at the cowl, which would reverse course and flow back along the hood. when you put a motor operated flap at the base of the windshield that opens based on pedal position, (my brother has a 69 and we put a functional cowl hood on his car) and then SEAL the hood on top of the air cleaner (it comes with a large rubber seal)
- it creates a really nice duct for the air to flow in and ontop of the carb.
when you lay the windshield flatter (like in the 4th or 5th gen) you remove that pocket of air at the cowl by creating better airflow over the windshield, and thus negating the positive effects of a cowl induction hood.
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