RHS head valve train??

The castings themselves look clean, no issue there.

It is a bummer that they will not take a common spring/retainer diameter OD, it seems you have to buy the $280 springs and then the matching retainers for another $60-$100.

They are also quite short on inst height, hence the pop up locks and or retainers that most use...along with machining to the spring seats/pads to get more on that end.

otherwise, they make good numbers.

It's app specific.