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Quad 8


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I bet it became the Northstar. The quad 4 had very similar heads compared to the northstar and olds was at the front of DOHC development for GM back in the day.

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For what it's worth, here is what Wikipedia says about the Northstar:

The "Northstar" V8, as it was then known, was an evolution of the Lotus-designed Chevrolet LT5 all-aluminum DOHC 32-valve V8 used in the Corvette ZR-1[1]. Archrival Ford Motor Company was developing a similar engine at that time as well, and Ford's Modular engine would precede the Northstar into production with its introduction on the 1991 Lincoln Town Car. Both continue in production at 4.6 L of displacement.Source attribution from Wikipedia
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