I wish I could take it back to the builder but it was me.
I had a bent rod, replaced the rod and piston. All new piston rings and rod bearings, gaskets and arp bolts.
Here’s the audio of it driving last week when I first noticed it.
Yikes. A big live and learn lesson there unfortunately. I've done stuff as bad back in my early gearhead days. Hang in there and double/triple check everything if you're gonna attack it again.
Yeah, It will be interesting to see what went wrong. I’m guessing a bearing. I’ll probably wind up upgrading something while I’m in there. This is an expensive hobby.