Aren't those "Hot Heads"? Were they new? Any idea as to why they are coming apart? You only run gas correct? Thanks Joel for representing and good luck!
I bought the heads new in about 2014. I had them ported, then when I first assemble the motor and tried to dyno it, one of the intake ports leaked into a cylinder and hydro-locked it. It blew out a cylinder wall and I had to have it sleeved. I had the head welded up.
When I had the cracks repaired this time, he said they were porous and difficult to weld and that the valve guides were to tight in the heads, leading to cracks. Yes, I only run gasoline.
