Fleetwood FWD V8-252 4.1L (1986)
FIGURE 2 - "BLIND" INTAKE MANIFOLD BOLT HOLES
Cylinder Head Intake Manifold Bolt Holes
The intake manifold bolt holes indicated in Figure 2 are blind holes. The remainder of the intake manifold attaching holes are open on the bottom. If the
blind holes become impacted with material or are not threaded to the bottom of the hole, the bolt will bottom out before the required "crush" has been
applied to the intake gasket to afford an effective seal. Technicians should assure that these tapped holes are clear by chasing the threads with an M8 x
1.25 bottoming tap. The holes are intended to be threaded all the way to the bottom. If this is not evident, continue to tap until this condition exists.
