273 Commando Piston Dome Volume

Hey Guys,

I’ve recently purchased a new set of Rebuilders Choice 4bbl Commando Pistons and need the dome volume in cc’s to calculate my CR. I’ve contacted Rebuilders Choice but they are unable to provide the information but said they made them from factory 273 Commando Pistons.

I’ve attached a photo of my one of my new pistons and a photo I found on the net of an original Commando piston.

Any help would be greatly appreciated.

Cheers guys

Luke