I made a few assumptions here: zero deck, 55cc chambers, 6" rods ...??
I certainly wouldn't give up the quench. I consider it a bad move to give up any amount at all for a marginal decrease in CR.
Do you already have the cam? willing to re-consider? The XFI292 would work great with that 12.4 compression, and bring the DCR down to about 9.0.
I can understand the XFI, with it's lower overlap, if you need good manners, less exhaust stench, etc. But, if not, consider a custom grind with more overlap (unless you have some outrageous cylinder heads that wouldn't respond well to the increased overlap). Just remind them one of your objectives is to limit low/mid rpm cylinder pressure because of fuel/detonation concerns.
And......by all means, get it dyno tuned when running that much compression
I certainly wouldn't give up the quench. I consider it a bad move to give up any amount at all for a marginal decrease in CR.
Do you already have the cam? willing to re-consider? The XFI292 would work great with that 12.4 compression, and bring the DCR down to about 9.0.
I can understand the XFI, with it's lower overlap, if you need good manners, less exhaust stench, etc. But, if not, consider a custom grind with more overlap (unless you have some outrageous cylinder heads that wouldn't respond well to the increased overlap). Just remind them one of your objectives is to limit low/mid rpm cylinder pressure because of fuel/detonation concerns.
And......by all means, get it dyno tuned when running that much compression