I know not a lot about this engine. It was a buddy’s who used to race it. I was told it’s a 400 stroked to a 470. He swapped his whole setup and sold this short block to another guy who bought these heads but never ran the motor. I acquired it. My own stupidity, it’s not like a SBC or Import motors I’ve worked on. This is definitely more motor than I’ve handled and am now realizing the precision it needs. I know the pushrod tunnels have been clearanced in the heads. The heads have been off an I have never noticed any kind of contact on either the piston of valves until now when the spring and retainer came off the valve.