intake manifold water passage block

[rich s]

What is the best way to seal off the intake manifold water inlet from the cylinder head/

[Joefisherff]

I've seen a rectangular cutout from a soda can silicone in place on a number of intakes.

[kea]

Put a little filler inside the passage, then epoxy over, making sure it doesn't protrude past the surface.

[rich s]

Would it be better to block the passage in the cylinder head? I suspect water is leaking past the gasket. I see water from the center intake manifold bolt.

[DaveW]

Would it be better to block the passage in the cylinder head? I suspect water is leaking past the gasket. I see water from the center intake manifold bolt.

IMO, while GCR says the water passage in the intake manifold may be plugged, there is no mention that one can do the same in the head. If something isn't specifically allowed, it is usually not permitted.

[DaveW]

Also, if it leaking around the bolt, just put some RTV on the bolt threads when you assemble the manifold to the head. IRRC, the bolt goes all the way through into the water passage, so it needs to be sealed.

[racersonly]

I just recently discovered that Pegasus sells a specially made intake gasket without the water hole. You still need to seal the bolt threads.

[kea]

The rules at one time, required "spec" gaskets to be used and intake to head was one.
Don't know if that has changed.