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Cometic Jims big bore head and base gasket kit supplies head and base gaskets sized for a 4.00-inch bore application, intended for engine rebuilds where accurate sealing across enlarged cylinders is required. Cometic emphasizes controlled load distribution and reduced bore distortion so installers can expect consistent sealing without additional sealants or re-torque, supporting long-term engine assembly integrity.
Cometic Jims 4in Big Bore Head & Base Kit .040in H/G .020inB/G
