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Message: <blockquote data-quote="foofinator" data-source="post: 966302" data-attributes="member: 15555">'Optimal' will depend upon the set up and some serious engineering equations (I was an aerospace engineer before law school).While you are correct in that you can run more boost on a lower compression motor, just the fact that a motor is high compression does not prohibit boost.With a good tune, and good fuel, 9-10 PSI should not be a problem for street duty! I will likely run e85.. It handles 30 PSI from my 3.4 whipple, it should be able to take 9 from an eaton with a little bumped compression. The key is not in the fact that the compression is higher, but in that higher compression motors will be more prone to detonation at the same boost level as their low compression counterparts.  Without detonation, a 400 rwhp 15 psi motor does not see a significant difference from a higher compression 400 rwhp 10 psi motor.  This is why I stress the good tune and gas, which is essential to any boosted motor really.I DO however, once I build the motor, plan to go the typical low compression route, as should the OP.  But, building motors is time consuming and is expensive, why not enjoy the stocker while you're building the bad ass stroker.</blockquote>