intergrated j 78
You are not the only that has or does use that head but many cut both intake and exhaust off of it. And to the best of my understanding the factory built a small lump into the head. I never got my hands on one yet! to cut the intake & exhaust off one to see for sure. But anyway you can still clean the bowl and Some vary little but a little of the port over the short turn area.
Wait, you literally mean there were people that cut the integrated intake manifold off the side of the head and machine the intake/exhaust face for use as a non integrated head?
