The Digicam tool uses a set of adapters (available separately} that slip over the crank snout to accommodate Chevy small blocks and big blocks, LS1s, Mopars, Oldsmobiles and Pontiacs. It runs on a pair of AAA batteries. The supplied bolt and spacer may or may not fit your particular engine depending on the particular combination of crankshaft and timing cover, but it is easy to fab an attachment adapter from a small piece of aluminum plate. You can also use it with the heads off by making a spacer to fit directly to the timing cover mounting surface. Then you can use a cam checking dial indicator directly off the lifter to accomplish the same measurements. Once you find max lift with the dial indicator, rotate the engine counter clockwise to approximately .100-inch before max lift and press the menu button. The prompt tells you to rotate clockwise to.050 before max lift. The digicam notes that position. Then press the BTDC (before top dead center) button and you are instructed to continue clockwise to .050-inch after max lift. Press the ATDC button and the display will indicate the crank centerline. Pressing any button after this will return to display the crank position.