1989 3500 4x4 454 in the UK

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Supercharged111

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Engine swap definitely, from '86 or older truck. The Chevy small blocks went to center bolt valve covers and TBI instead of a carb in '87.
EDIT: this is a big block! But the carb/TBI difference still applies.

But the valve covers remained perimeter bolt through GenVI. Not sure what the 8.1 got.
 

454cid

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But the valve covers remained perimeter bolt through GenVI. Not sure what the 8.1 got.

Similar.... I think they're a little shorter, and they have bosses for the coil packs. I assume the bolt pattern is the same, but I suppose the holes could be different since the GenVii is metric.
 
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