How to Remove the Intake Exhaust Manifold on a 6-Cylinder Ford 300by Robert Bayly
The Ford 300 cubic-inch in-line six cylinder engine was the largest "straight" six cylinder engine produced by Ford, and is found only in trucks. This engine uses a combination intake-exhaust manifold that must be removed as a unit. Over time, the manifold may suffer a crack, or the intake or exhaust gasket may develop a leak, requiring removal. The DIY mechanic should be able to remove and install the manifold unit in about four hours.
Park the Ford on a flat paved surface and set the parking brake.
Remove the air cleaner assembly.
Disconnect the throttle linkage at the carburetor by lifting the small metal clip upward and pulling the throttle rod out of the throttle linkage. Unhook the throttle return spring at the carburetor. Remove the vacuum advance line from the carburetor. Use a slotted screwdriver to loosen the hose clamp on the fuel line where it attaches to carburetor and remove the fuel line.
Use a slotted screwdriver to loosen the hose clamp on the brake booster hose at the intake manifold and remove the hose.
Use a ratchet and socket to remove the two nuts from the exhaust pipe where it attaches to the end of the exhaust manifold. Slide the exhaust pipe flange off the manifold studs.
Use a ratchet and socket to remove the 10 bolts and three nuts that secure the manifolds to the cylinder head. Remove the manifolds from the cylinder head.