The only reason to have a static compression ratio much above 9:1 is to compensate for the closing point of the intake valve of a long-duration camshaft. If the valve doesn't close until the piston is 1/3 of the way up the compression stroke or further, the remaining cylinder volume must be squeezed tighter just to get the compression pressure back to where it used to be before Harry Hotrodder installed that radical cam to get the lumpy idle note he wants.
Unless the engine is going to see a LOT of full throttle high RPM operation, a high static compression ratio and a relatively mild cam grind can cause a lot of problems with detonation at low to moderate engine speed and a little bit of "lug" where the throttle is opened up and the engine can't accelerate freely. Other than nuclear, gasoline engine detonation is the most destructive explosive force known to mankind. Ounce for ounce, gasoline vapor has the potential for more explosive power than dynamite, TNT, or C-4.
Jerry
