Porting small block 915 j-heads

They are cut regardless of the amount when the guides are done.

I've cut 3/8 off them, stuck in a one pc bronze guide and let the guide alone protruding from the ground down guide boss. No issues. I run 220 seat 500+ open
I dont like bronze for endurance, it's great for wear and forgiving to stems..but it doesnt hold up like steel guides do.
So where is the ops grinder and carbide bits? Let's get to the guiding as he goes...
Whoever leads him to water has to buy him the jb weld , low psi cap..and the stop leak!