Indy programs aren't terrible, and some are actually pretty good. The trouble has historically been the terrible VJ, the horrible blending, often with either .003-.005 guide clearance, or, even worse, .0005 on the exhaust lol. Or a big ole curl of aluminum under the seats so the fall out in the oven.

The human part is where a good program goes to die. Also core shift castings, with porosity that leak.


I've had them port heads before with no seats, and no guides.