He has to comply with FIAs homologation form #3047
I the class he's running they have to run iron std block and heads.
They can change crank, rods and pistons, but have to stay with std bore and stroke.
Porting is allowed but the port cross section area and measures can't be changed.
I know the Danish Panteras that ran a few years ago were using australian Blocks - the US Blocks being too weak and cracking the cylinders. They were about 530 HP with Webers and 180s
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