Originally Posted by AndyF
For a performance build all blind holes in the block should be bottom tapped and then cleaned. Especially any threaded hole used for studs. Buy a set of bottom taps and use them. You'll be amazed how much crud is trapped in those threads, even after hot tanking.


The holes are clean. I looked with an endoscope. So you are saying cut more threads and run the studs down to the shank?