Ported by Ron Borrink (Rocket pipes). These were on my buddys motor and I bought his stuff from him and have no use for these so Im passing them on for a killer deal. They will need the spacer plate to run with the port work. I would call these an aggressive dune port. They are .080 over 795 sries pistons, I will have pics of them tomorrow. This complete topend is ready to run, slap on and go.