Replacement 5.9l Piston Recommendation

is that a true measured number of just one out of a book???

It will raise the compression a little, but you also have to take the block deck height into consideration...

That is the correct volume, unlike LA's the Magnums never came with any other chamber size from factory and EQ's are same. I believe Edelbrock might offer different but we dont use them in our shop, too many issues with them. Off the top of my head, I would say at least a whole point or more going from 70 to 63, probably put you at around 10.5+