COMP Cams Top Dead Center Stops are designed to positively stop the piston in order to find top dead center. The bolt style screws into the spark plug hole, while our universal plate type bolts across any cylinder bore when the heads are off. PartNumber : cca4933 Description : Top Dead Center Stops; Deck Plate-Style; Heads Off (Universal) Title : 4933 Piston stop, (Head Off) California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Uncategorized::Uncategorized