SETTING TIMING ON 95 GMC SIERRA 2500 - Sierra 2500 GMC Cars & Trucks

350, 305, 400. Crank shaft gear mark is straight up to the camshaft gear and the camshft gear is straight down to the crank shaft gear. If your looking for the rotor button / distributor. The button should be pointing to the number one cylinder (drivers side front) On the compression stroke. To find the compression stroke pull the number one plug , put you finger over the hole, crank the engine untill the pressure pushes your finger off, then put a stiff wire in the hole and turn the engine by hand (wrench) untill the wire comes up and just starts to drop. Move it back and forth to get top dead center. On the distributor Number one and number eight should be horizontal with the radiator.