Piston queston

[opeltwinturbo]

I have a set of new pistons with the only markings on the box read:

455 SPCL V-2 "STD"

The stamping on the piston reads: H39 NP

Are these just a mild stock standard bore replacement piston or something that can make some serious HP?

Thanks.

[71stage1conv]

Are the cast, hyperneumatic or forged, but I think the standard bore is going to be your limiting factor?:confused4:

I'd ask Mike at TA...