Proform 66792 Top Dead Center Locater Go to amazon.com Related posts Top 11 best timing tape sbc for 2024 Top 11 recommendation timing tape 6-3/8 2024 FeatureTOP DEAD CENTER LOCATER DescriptionProform Top dead center locator. Fits small block Chevrolet V8s. Proform's top dead center finder threads into a spark plug hole and provides a positive stop for the piston.