That's a bit of an open question.
A 3" pipe will flow 1200 CFM before it goes "critical" (Mach .4)
At it's critical speed you're heating the Air through friction.
You can convert the 1200 Cfm to lb's/min so around 83.
This gets you into the GT42/104 Compressor size range at a 2.8>3...
Again personally I wouldn't risk it at that HP level, these motors move around a hell of a lot at high output.
Lower power with the holes washed with thinners and sealed with loctite you'd get away with it no probs.
I tend to be a bit conservative though so it's really up to you.
DOH :(
At a guess I'd say that's what cracked it.
You get a buildup of crap in the bottom 1/3 that the bolts don't reach but the studs do.
Also looks like the block wasn't deburred after decking so that can contribute as well.
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