Tests to measure iron levels include: 1  Serum iron. 2  This test measures the amount of iron in your blood. 3  The level of iron in your blood may be normal even if the total amount of iron in your body is low. 4  For this reason, other iron tests also are done. 5  Serum ferritin.
one symptom of a cracked manifold will be a visible crack that you can see on the manifold s surface to look for a crack look closely at the manifold particularly where it bolts up to the motor and where the most heat will be
Why manifolds crack and leak. As you can imagine, exhaust manifolds are subject to intense heat. Theyâre also subjected to considerable expansion and contraction as they heat up and cool back down. Over time, this leads to metal fatigue (both cast iron and other types of exhaust manifolds are subject to this).