Here's why:
* Valve Design: The 396 big block (and most older engines) uses non-interference valve design. This means the valves and pistons have enough clearance to avoid colliding even if the timing belt breaks.
* Timing Belt vs. Chain: The 1965 396 used a timing chain, not a belt. Timing chains are much more durable and less likely to break than timing belts.
Important Note: While the 1965 396 itself was not an interference engine, later versions of the 396 and other big block Chevy engines might be. Always check the specific engine model and year for accurate information.
