Right, except it’s a roller cam!
So everything you said was completely irrelevant. No cam break in needed for a roller cam.
And yeah, you totally jumped all over the guy. And you’re totally wrong to boot, because you popped off without even asking if it was a flat tappet cam. Open mouth, insert foot.
10-30w is pretty light, but it’s a brand new engine. With the plug out I’m not sure you’d even manage the pressures you’ve got, but it’s possible.
Check for the plug. If it’s installed and that wasn’t the problem, you can go 15-40w or 20-50w. Thing is, your oil pressure now is as high as it’s going to be. The tolerances should be as tight as they'll ever be with a brand new engine. So, if the plug wasn’t left out, there’s a chance you have fairly loose tolerances on that brand new engine.
I’d check for the plug, then try a heavier weight oil before I messed with the oil pump. Just see what you get first. Modern machining techniques usually give tighter clearances than what these engines had 50 years ago from the factory, so, it follows that you should see higher pressures than was normal in the 70’s. You may have clearances that are a bit on the loose side. Which isn’t necessarily bad, but it’s worth figuring out now. Talk to your engine builder, better to get it sorted while it’s still under warranty from the shop.
