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Does the bolt holes that connect the intake and exhaust to the engine head need to be machined as well after the front surface has been machined flat? I'm suspecting that my issue might be that since the surface was machined flat, the bolt doesn't sit evenly between the intake and exhaust holes. The bolt, when torqued down to the head, torques the exhaust side down but not the intake as the surface is slightly below the exhaust side. This is making me think that the intake wasn't getting fully bolted down since its bolt holes are not even with the exhaust holes. Does this sound reasonable? If the holes are not even, is there a process to get the bolt hole sides to be even that isn't guess and check?If the manifold assembly has never been machined flat by a machinist in the past, it’s guaranteed to be warped and not sitting flush on the head. At this point- all virgin 2F manifold assemblies are warped. Mine was warped in 1988 when the engine only had 42K on it.