Believe what you like. Daihatsu is the importer. I've been in several Vanguard engines, and have a different opinion. If Daihatsu is casting the pistons, cases, and crankshaft, they are doing a worse job than China. Pitting, voids, poor surface finish(inside, not outside), un-chamfered flashing edges. Some of the worst stuff I've seen.
Best of luck!