What makes an under-stressed engine?

[forrestgump]

The Rover V8 amazes me. It starts off as a 3.5L engine and TVR can bring it up to 5L with boring and stoking and the engine can still cope! What are the scerets of building a under-stressed engine like the V8?

[forrestgump]

I found that post really helpful mate, thanks.

cortinaman said: didnt they make the rover v8 from a buick block?

You are right. Rover bought the engine in 1964 from GM.