You detonate it, you break it.
Impossible to build a detonation proof engine, so everyone wants to blame the stock block instead of their aggressive tune-ups.

Between my Dad, 3 brothers and I, we've raced for 25 years, and beat on over 35 B and RB engines and never, NEVER cracked a main web...not once! Split cylinder walls, yes, broke LY rods, yes, all kinds of other carnage, sure...but no main web damage.

Current engine in my brother's 3300lb street strip Gremlin is a non filled 440 with stock caps and ARP studs, stock 440 crank, h-beam rods, icon pistons 10.5 to 1, solid cam with Indy-1 heads and two big shot plates. 8.87-149 at 16 degrees of timing and C-12. He wasted two sets of pistons with fuel delivery issues, and claims the cap walk chaffing is "significant", but it has two drag weeks, thousands of street miles and a 100 runs on it.