430 Thermostat Question

[bcomo]

Is the thermostat for a 430 the same as for a 352?

I see only one thermostat listed by vendors --BUT there's a separate thermostat gasket listed for the 430 only by Mac's. Would that mean that the themostats are different?

This would be the main thermostat behind the surge tank.

Thanks for any help.

[Alexander]

The thermostat behind the surge tank is the same size for the 352 and the 430. The 430 also has two unique thermostats in the cylinder heads. These are hard to find, as they are not reusable once removed.

Those cylinder head thermostats look like this:

[bcomo]

[quote=Alexander;15326]The thermostat behind the surge tank is the same size for the 352 and the 430.

Alexander:

Thanks.

BUT-- Why do you think that the vendors show a special thermostat gasket "for 430 only" if the thermostats are the same. Could it be that the size of the surge tank coupling to the block is different?

P.S. I'll take a pair of those head thermostats

[Alexander]

Yes, the gasket for the expansion tank is different for the 430 and the 352, as per the blue Ford parts book.

430 - part C1VE-8255-A - 2 outer holes - 2.24" center hole - 3.24" center-to-center of outer holes

352/390/428 - part B8A-8255-A - 2 outer holes - 2.22" center holes[sic]

[tbird430]

I removed those 2 behind the waterpump going into the heads. I was told they were not really needed unless I lived in Alaska, Canada, or another really COLD area. I was also learning about hard to find the replacements would be and that Ford omitted them in the 427-428-429's because they were really not needed in them as well...

[bcomo]

Alexander:
Thanks alot. That solves that mystery for me.

tbird430:
I really don't know if mine are in there or not. Engine had been rebuilt, but the owner is deceased. If I ever pull the pump, I'll take them out if they are there.

[Guest]

The fact that water didn't run through the manifold to keep it warm in cold conditions and supposedly quicker heat to the heater core was the reason for these stats. Honestly it was the stupidest idea in the world considering by 50's standards to change them was a major undertaking.A better heat riser design would have been easier. 430's with air are hard enough to work on when the pump goes bad who needs extra non- sense.

[KULTULZ]

The fact that water didn't run through the manifold to keep it warm in cold conditions and supposedly quicker heat to the heater core was the reason for these stats. Honestly it was the stupidest idea in the world considering by 50's standards to change them was a major undertaking. A better heat riser design would have been easier. 430's with air are hard enough to work on when the pump goes bad who needs extra non- sense.

Please allow me to correct this.

Coolant did run through the intake on the MEL Engine. The lower thermostats (and divertors) caused a current to be setup that forced coolant into the rear of the intake and out the front (most designs are cross-over). This allowed elimination of the heat riser and it's associated problems.

It was a good design but a service nightmare if the lower thermostat(s) failed. Later LINC 430 had the choke operated by coolant temp and the lower thermostats were discontinued in 1963 (divertors were retained).

[tbird430]

So in the end, we are ALL saying the 352cid & the 430cid (upper t-stat) are ALL the same, just the mounting gasket is different...?

[KULTULZ]

Correct...

[Djweaz]

In the middle of trying to find a leak that goes to the back of my pan. I see one thermostat housing under the tank. So If I’m reading this thread correctly there are thermostats in each side of the water pump as well? Looks like it’s going to be a PITA to get to to find the leak.

[jopizz]

The thermostats are below the heads on the ends. I doubt if they were leaking that you would see it in the valley pan, most likely on the ground. I would suspect either the expansion tank thermostat opening or the hose from the intake to the water pump as the source of your leak.

John

[jopizz]

Here's a picture of where the thermostats are. As you can see they aren't anywhere near the valley pan.

John