Breathing deep (porting my heads)

[bmxmon]

Is there any water jackets below that hump thing?? It seems that the humps and valve holes are level, so do i grind down the valve hole, or leave it along?? Thanks for telling about the motor mounts, havent been able to find that info anywhere. Should i be using the spring compressor up against the valve?? That is what i did for 4 of the valves. They seem to have some carbon build up on all of them, so can i just scrap that off?? thanks again.