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Not sure if it counts since it is still a concept, but the XV-16 13.6L Northstar would be the biggest made. Production-wise there is only one size, the 4.6L.
 

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The XV16 engine built for the Sixteen concept car is a 13.6 liter pushrod engine. Supposed to make 1,000 HP and 1,000 lbs-ft torque.

The XV12 built for the Cien concept car is a 7.5 liter, 750 HP, 450 lbs-ft torque DOHC (Northstar?) engine.

Jim
 

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I was wondering if Caddy made a V-16 Northstar 'cause I knew the one in the SIXTEEN was a pushrod engine. The V-12 in the Cien is a Northstar. They had an engine sitting next to the Cien when they had it at a show and it had overhead cams.
 
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