the later two piece water neck and thermostat housing will mount right to the earlier intake.
It's my understanding the one piece, cast aluminum unit was the original design used on these motors for ag applications, it was also used on some of the turbo-motors.
I found two of the aluminum housings at our core supplier last Thursday but they were rotted way beyond any kinda use. I did pick up a few more of the more common stat housings with the small bypass hole that was oem on the 152, those can easily be drilled for use on the sv apps.
We've just received a major supply of rs370-pattern thermostats directly from the manufacturer, in all setpoints. These are the latest production units, not the chinese knockoffs that some vendors market.
This pic is a 152t intake with the one-piece water neck, notice this manifold also has an "'active" heat riser passage, though it May have been mounted originally with an intake gasket with the heat riser blocked such as used in an lpg application.
This particular manifold is in the wiese collection.
