A moot point as this engine will be coupled to a 5 spd manual.
I was referring to the economy of buying 87 octane as opposed to being forced into 91-94 octane.
Anyhoo, the pistons have a dish machined in them and they hold a volume of a tick over 9 cc's and knocked off a total of 22grams for a weight of 572grams. Final compression with + .010" deck height maths out to 9.09:1. Missed it by that much. J.Rob