I will be doing a sohc build n/a just to have some fun with it but I do have a gsr with 13 to1 compression and some nice head work with flat face vales the same will done with the sohc or higher people may say don't do it but what every I say just do it too see what it makes and what it do people told not to go high with the gsr but it is still running with no problem so do what you do and keep it moving and if you blow it up how much is a sohc vs a gsr ok then