Bore=it is the width of the cylinder where the piston moves up and down... the cylinder itself is referred to as bore sumtimes...
stroke=stroke is the distance the piston travels up and down... depth of the bore...
ground clearance.= the height of the vehicles surface. the space between road and the vehicle surface
wheelbase=distance between the two wheels... the larger the wheelbase.. the wider the car..
compression ratio= it is the ratio of the area above the piston when it has fully moved down.. and when it is at the top
OHC is overhead cam... cam is wat determines when to open the intake and exaust valves on each cylinder...
the counter part is DOHC(or Twin cam)=Dual overhead cam.. this uses two separates cams.. one for intake valves..and other for exaust valves... to vary their angle on the piston top for increased efficiency