I'll be using small block V8 gears in the stovebolt housing (they're the same diameter) and a surface-ground spacer plate about 1/4" thick to accommodate the longer gears. I'm guesstimating about a 20% increase in volume with a minimal amount of reshaping of the inlet and output tubes. I made the first spacer plate on a lathe with a 4-jaw chuck and turned a pair of overlapping holes at the right center to center spacing, then hand-trimmed the outside shape of the plate to match the shape of the pump housing. Once it's working on the prototype pump I'll use it as a pattern for a reverse-engineered CNC mill program that my son-in-law can write. Then they can be mass-produced as needed. He's a tool room machinist for Remington Arms in Huntsville Alabama.
Fred, from a purely subjective viewpoint, it looks like the spring-loaded disc in the oil distributor is designed to restrict oil flow to the head until there's enough force exerted on its surface area by the oil pump output to push it off its seat and allow some oil flow into the through-block oil line to supply the rockers. As the engine speeds slows and/or the oil thins out due to heat, it will require more pump volume to push the disc off the seat. That will direct more oil to the lower end to protect the bearings. I've seen several references to 15 PSI as the starting point for flow to the head.
Jerry
