Damn! I thought it was welded on. I beat on it with a 3 lb hammer and hardwood block From just about every angle and finally gave up on it. I figured I might as well salvage the glow system plug for temp. No idea what it’s called & the coolant hose fitting on the aft end. No sooner than I pulled on the wrench the head broke loose. 😂
It looks like 3 of 4 pre chambers got really hot but no visible damaged to any of the valves, pistons, or cylinder walls near as I can tell. I’ll get a straight edge on it tomorrow.