need to know what i need to do to put a hemi type cylinder head on my 1.6 cvh leanburn engine. some1 said that if i just bolted on the head it would mess with the compression. i have a stage 2 head with fast road cam and i really wanna use it. will i need to change pistons and stuff. surely there cant be much difference between the bottom ends of leanburn and hemi engines. please help as i cant find this information anywhere on the net