I strongly believe that if you get a 10.5:1 piston to drop into the 865, and get something close to the 790 cams specs, the 865 would perform to the 904 level. Just upping the compression and 40cc's on the 865 is not going to effect the total HP, as the cam profiles are for lower RPM torque. Sure, you'll some, but blasting dyno's means making power at high revs. Really, if you talk about every day around town performance, the conversation should be focused on, or at least include torque increases as well.
