MBHD, The HV Mellings pump is only High Volume the relief spring is the same on the pumps.

Mellings states that HV pumps are not harder on the dist. gears just flow more volume.

The point I was trying to make why not run one for the extra safety of knowing you have enough oil flow.

Everyone thought dist. gear wear was from higher pressure of the HV pump, but it's from missalignment of the dist.gear to the camshaft gear.

Harry

Turbo-6