lol Rat motor because rat rodders use em? I'm sorry but your wrong on that one. Mouse motor are small blocks because they are smaller Rat motors are big blocks because they are bigger and rats are bigger than mice. Look at a engine (people say motor but really motor is something like an ELECTRIC motor, in reality there is no such thing as GAS motor, learned this from my old auto tech teacher) from the front and looks like a mouse with the valve covers the ears, etc. So of course the big blocks are going to be bigger with bigger heads, etc, etc.