Is anyone aware of an aluminum riser for the 4.2L engine (Shown in the attached, pictured above gasket #24). When replacing my thermostat housing, riser and water pump, I noticed that an area of the riser's top sealing rim was sheared or cracked off.

I know the 4.0L solved plastic thermostat housing crack issues by reverting to aluminum. Just curious if the same de-evolution has yet occurred for the 4.2L engine, as well.

Thanks for any positive leads.

 

I'd be surprised if they are not fully interchangeable, and ISTR seeing that someone had reported a switch on a 4.2l to the aluminium one as part of a larger revamp, and right here in the forum.

Search function should turn up the suspects...