[justinp71]

Good work, couple of things I found from doing some similar measurements myself-

-Check your JE piston dome net volume on the job paperwork, it may vary from the box (mine varied 1cc thus add +.2 compression.)

-I would put cylinder #1 at tdc mount the head, leave the base gaskets dry, torq the head down, tilt the motor so the spark plug is straight up and fill the spark plug hole with atf using a buret (you can buy one on amazon for $25), to calculate the compression ratio. This will be much more accurate, which you will need when getting up to 10:1. This really eliminates tolerance build up and gives you a true compression ratio.

-Anything over 9.5:1 compression on 91 octane gas is a little risky especially with the wide 98mm pistons. You may want to bump your compression down or retard your timing... something to think about...

Oh also something I learned when using plastic measuring instruments, make sure the temperature is correct, they will expand or contract on you. That syringe you have could be off 5% or so which could make a significant impact on your compression ratio.

Edit: just noticed your running twin plug, so 10:1 should be good...

Good Luck!!!