Lean mixture melting pistons in action!
You can shave a lot off the head, but it weakens it because you're making it thinner. If you have high hp goals in the future(300whp+ maybe?), you will probably not want to use a head that's been shortened that much.
If no sharp edges and smoothed out, you will probably be fine. Have the machine shop shave what you want/need, then make sure there's no sharp edges and run it if you want. But, give that engine more fuel!
You can shave a lot off the head, but it weakens it because you're making it thinner. If you have high hp goals in the future(300whp+ maybe?), you will probably not want to use a head that's been shortened that much.
If no sharp edges and smoothed out, you will probably be fine. Have the machine shop shave what you want/need, then make sure there's no sharp edges and run it if you want. But, give that engine more fuel!