Why is there no bolt hole on the end of crankshaft your Chevy engine?

There's no bolt hole on the *end* of a Chevrolet engine crankshaft (or most any other car engine crankshaft) because that end is typically where the crankshaft's pulley or harmonic balancer is mounted. This is done using a large nut and sometimes a keyway, not a bolt. A bolt hole there would interfere with the mounting of this crucial component. The pulley or balancer is vital for:

* Driving accessory belts: The pulley drives the alternator, power steering pump, water pump, etc.

* Dampening crankshaft vibrations: The harmonic balancer (or damper) is designed to absorb vibrations produced by the engine's reciprocating motion, preventing damage to the crankshaft and other engine components.

While there *are* bolt holes *on* the crankshaft, they are located further inboard (closer to the engine block) to secure the flywheel (on the other end) or other internal components. The end of the crankshaft itself needs to be smooth and precisely machined to properly interface with the pulley/balancer.