How many amps are needed to start a V 8 engine?

There isn't one set answer for this. It'll have to do with the displacement of the engine, the output of the starter required to get it to crank at enough speed to start, etc. Huge difference between, say, a 4.6 liter Land Rover V8 and a 12.0 liter Detroit Diesel 8V92 diesel V8.