High RPM Backfire when fully warmed

TheGrimSpeed said
How much PSI would I need in each cylinder? Do you have a link to the spring removal tool. I have never had good luck with a spring removal tool, but this is a pedestal mounted rocker maybe those type of removal tools work better!

I use the hose from my compression tester and just plug it in to my air compressor. It runs at 120psi.

Search here there are threads about valve spring compressors.

Magnum Head Valve Spring Compressor