What has happened along the way though is the motor is now larger. The stock head is not big, the cross sectional area, for a 117" 2cyl. The stock SE255 at 9.9 would be dicey. Require a perfect tune with timing mods. But why? Everyone is so worried about "low end torque". Relax the motor is the equivalent of a 468" V8. It picked up low end torque by virtue of the size. The 259 cam was and is a big cam in a 96" motor is now calm and streetable at 117". Don't make the mistake of going too small with the cam. It will run very hot and ping. The SE585 is not too small, the SE255 is. There are many 240-245° cams that work well in this motor. If the heads are ported properly they will not lose low end torque either, just extend the torque curve and pull harder on top. Concentrate on a pipe choice that will match the performance you want too. Once some overlap is added (cam change) the motor will become more pipe sensitive. Get it to a great tuner and use a flash device, TTS, Direct Link, or Power Vision. the tuner decides. Do not lug the motor, downshift. Your crank and compensator will love you!