My personal issue with the assembled heads is, I don’t have a lot of faith in the parts........ so I just wouldn’t use them on my own build.
But if you trust the parts........ bolt em on.
I’m sure over 50% of the assembled heads that get sold get run just as they come right ootb.
The one set of SBM Speedmasters I had through the shop, the only thing that would have been an actual “problem” had they been run ootb was the valve seals.
They fit the guides poorly and I’m sure the motor would have had higher than normal oil consumption.
A couple springs were a little low on pressure, but depending on the cam, that may not have mattered.
Other than that, they were fine.
Not “great”, but fine.
