Kim they are TRW drop-in replacement gears. I usually just throw OEM high mileage pumps in the bin "just in case," and stick a Melling assembly on, but the design of these gears got me curious about the Milodon "race" pumps. No one on here really cares about minute HP loss or revamping an old pump housing, which I understand, but I thought (wrongly) that someone would know the advantage to that design (if any). Not a big deal, but I'm going to try it. I have a refresh-job (rings and crank bearings) on a 413 coming up when the crank is done and I think I'll try the TRW gears and 80lb. spring on it, with 1/2 groove mains and see. Not a high RPM build, conservative hydraulic cam and 3/8" oil pickup. Also I have a short-rod 456" (4.402" bore 400/3.75 crank) B with full grove mains to assemble (1/2" pickup), so that would really be a good test.
