COMP Cams Top Dead Center Stop Tool- 18mm Bolt Style H77803FS Blocks are 2-1/2"W x 5"L

Blocks are 2-1/2"W x 5"L

Panels are available in two-

1992-1999 GMC K2500 Suburban

2004-2005 GMC Envoy XUV

COMP Cams Top Dead Center Stop Tool- 18mm Bolt Style H77803FS Blocks are 2-1/2"W x 5"LCOMP 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. Designed for heads on applications, this piston stop features 18mm thread for use in Big Block Ford engines. Positively stop piston in order to find Top Dead Center (TDC); Bolt style screws into spark plug hole