COMP Cams Top Dead Center Stop Tool- 18mm Bolt Style H77803FS 25" wide and 1

25" wide and 1

2008-2009 GMC Envoy

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

1992-1999 Chevrolet K1500 Suburban

COMP Cams Top Dead Center Stop Tool- 18mm Bolt Style H77803FS 25" wide and 1COMP 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