Mostly sold to tracks and sanctioning bodies, having one of our Cubic Inch Testers tends to keep everyone honest. With a cylinder capacity of 84 cubic inches in 1/2 inch increments, our tool can pump a V8 as large as 670 cubic inches total. Easy to use. Just remove the spark plug, push rods and rocker arms from the cylinder being checked. Then, screw in the spark plug adapter, and turn the engine over by the starter. The puck assembly will indicate the amount of air (in cubic inches) in that cylinder. Multiply this figure by the number of cylinders to get your total engine cubic inches. Includes wooden case, 14mm spark plug adapter, hose, thermometer, temperature correction factors and complete instructions.