I had to spend $120 on a valve spring compressor to take my own heads pull them apart and put them back apart. I destroyed two or three rentals locally and finally gave up and bought one! Lol next step is the grinder Brother, except I actually need something to cut on... my 340 heads are maxed out and the big block heads I got could use work in the exhaust (it looks like a stock port opening) but the intake is open