4S6137 Taperlock Manifold Stud Fits Caterpillar Fits CAT 735 740 65E 75E D350E DOne New Aftermarket Replacement Taperlock Exhaust Manifold Stud Fits Caterpillar (Fits CAT) Engines and Equipment This taperlock exhaust manifold stud secures the exhaust manifold to the cylinder head on Fits Caterpillar (Fits CAT) 3400 Series and related engines. The taperlock design locks firmly into the casting bore to resist loosening under high heat and vibration cycles. Made from high temperature steel rated to 500 degrees C maximum.