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post 2000 Northstars

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When was Northstar improved by means of stronger (longer) headbolts? As far as I remember it was 2004. What kind of changes were made in 2000? Thank you.

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The engine was practically redesigned for the 2000 model cars. Including a new part number head bolt (pitch change).

And the head bolt pitch was changed again during the 2004 model year production.


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