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COMP Cams 18mm piston stop bolt is a heads-on piston stop used to positively locate top dead center (TDC) by threading into the spark plug hole. With an 18x1.5mm thread size it is intended for Big Block Ford engines and lets you accurately find TDC without removing heads when degreeing or checking piston position, offering a simple mechanical stop for timing work.
COMP Cams Bolt 18X1.5MM Piston Stop
