Lunatic valve springs frustration!

Purchase a cutter and install it in your hand drill.
Also purchase a valve spring mic. Now you can check your valve spring height.
I made a wooden plate, two plywood rectangles out together with the bottom cut out for room for the nuts to attach to the bolts that run through the head to attach the head and hold it there.

I C clamped it to my bench. Ran the cutter in the drill gun until I cleared the obstruction and lightly shaved the outer spring seat.

I realize iron is way harder than aluminum. It’ll take time to do each one. But you can do it.