Quote:
Originally Posted by Umai Naa
It was their choice to make.
They nominated the 5.6L motor well before the Nissan deal was even signed off on.
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If they were nominating the 5.6, they were probably told what bore they had to use - which probably ruled out the 4.5 litre at that point. Volvo didn't have a bigger V8 than the 4.4; what I don't know is whether Volvo/Polestar had to fight for the smaller bore, and stroke it to 5 lt, or if V8SC offered it up.
Even when going to the 5.6 litre motor, they still had to use larger pistons than the factory block. Ex factory, the bore/stroke is 98/82mm, the VASC version is 102.69/75.31mm. Given Nissan wanted to start with a stock block, maybe the VK45 didn't have enough meat to run those pistons, ex factory that block has 93mm slugs. The VK45 block was cast in japan; as far as I know the VK56 was cast in the US, so differences are likely.
Perhaps what Nissan/Nismo/Kellys should have done is hold out for a better combo in the early stages before announcing the program.