Opel Rallier since 1977
I'd have to run some numbers and it might take a couple of days to get the time.... have a project to build at Ft Knox this week.... not in the gold vault! LOL I need to dig back into those cam specs too.Those DSS pistons are available in several compression heights and dish volumes so it would be easy to achieve pretty much any desirable CR from below 8 to as high as 13. This is based on a bunch of numbers I ran last night from the Summit website. So given a can such as the GM77 which Charles says runs about between the OR 66 and OR77 specs, what target CR do you think one should shoot for?
But generally, in the upper 9's for SCR is where I would head just at first guess based on other motor work. Are you going to run that Sniper system?
BTW you can take your static CR and the cam specs and work through any good DCR calculator and look to get a DCR of high 7's to 8. The trick is to interpret the Opel cam specs, which give duration as seat-to-seat, but you need more like .006" lift duration numbers to get an accurate DCR. (The .006" number is for a hydraulic lifter cam; a solid would be different.)
Just be aware that your rod-stroke ratio is getting low, down close to 1.5, as opposed to the stock 1.9L rod-stroke ratio of 1.8. So it will be the typical low rod-stroke ratio stroker.... it'll not rev as high before starting to flatten out. (There is a reason that a 2.6L Misubishi kept a longer rod and deck height...to keep the rod-stroke ratio up.) So, you'll want to keep the low RPM torque good to keep a reasonable total RPM range. Of course, 2.6L in a light GT will no doubt move along.