Heavy duty Y block exhaust valve cap

[runmikeyrun]

Hi guys!

My Y block is a heavy duty edition (truck motor) and the exhaust valves are larger than the intakes and are sodium filled.

Stupidly, I lost one of these valve lash caps while replacing the valve seals.



Any leads on replacement? The valve diameter is 0.434” (as seen online and the parts guy at Summit Racing told me) and I’m sure other Ford engines used these caps. Anyone have a link for a part number or know what other engines used these caps? Not having much luck finding aftermarket or eBay when searching for Y block.

Thanks in advance.


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[fordrodsteven]

Maybe find a "Y" block rebuilder near where you live. They may have a few spare parts or can tell you where to find the part. Are you sure about that .434 stem Diameter? Seems awfully large to me but then I've never been inside a "Y" block.

[paul2748]

Contact Ted Eaton in Texas. he rebuilds Y's and should have some around


Ted Eaton (254)857-3339
[email protected]
1060 Wolf Creek Rd., Lorena Tx, 76655


Or John Mummert


(619) 596-0312

faxes: call first. Due to the ridiculous number of junk faxes I can no longer leave it on.

E-MAIL: [email protected]

[runmikeyrun]

Thanks, I sent Eaton an email!


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[40 Deluxe]

Originally Posted by fordrodsteven

Maybe find a "Y" block rebuilder near where you live. They may have a few spare parts or can tell you where to find the part. Are you sure about that .434 stem Diameter? Seems awfully large to me but then I've never been inside a "Y" block.

Yes, that is the right diameter for the HEAVY DUTY truck 292 only. These exhaust valves have hollow stems which are filled with sodium to help cool the valves under extended full throttle use. When hot, the sodium turns liquid and splashes around in the stem, carrying heat from the valve head into the stem, and then to the water jacket through the valve guides.
These engines also had steel cranks, and shorter rods for some reason. Therefore they used special pistons with the pin lower in the piston.

[darrell]

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if ted doesnt have one ill send you one.plenty of used ones around but i dont think you could get a new one.

[runmikeyrun]

Thanks guys, Ted has one and will be sending it out. I appreciate the help!

Guaranteed when I pull the truck out it will fall from wherever it is hiding lol


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[big job]

I also lost one on a 332 Y = Precision Engine right down my street stocks those. He said
common on race engines.

[darrell]

its to bad ford didnt use these on all y block valves.they are hard and dont wear.valves are easy to set.

[scicala]

Originally Posted by big job

I also lost one on a 332 Y = Precision Engine right down my street stocks those. He said
common on race engines.

Yeah, but race engines don't use .432' dia. valve stems.


Sal

[runmikeyrun]

Originally Posted by scicala

Yeah, but race engines don't use .432' dia. valve stems.


Sal

From what I know they’re known to fail due to the valve not being solid, but that’s just what I read on the interwebs


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[packrat5]

I never saw a failure on any of those heavy duty heads except an occasional seat coming loose

[craig]

The problem with any of Ford's sodium filled valves, they would occasionally break. I have seen several on the FT series and 1 on a Y block

[darrell]

we seem to have gotten lost we were talking about caps not sodium valves.that was what i was talking about at any rate.

[40 Deluxe]

Originally Posted by scicala

Yeah, but race engines don't use .432' dia. valve stems.


Sal

As I remember, the valve tip is a smaller diameter than the stem to take regular sized lash cap.

[runmikeyrun]

Originally Posted by darrell

if ted doesnt have one ill send you one.plenty of used ones around but i dont think you could get a new one.

Hi Darrell,

Ted sent me one but it is too small! If you have the right size can you drop one in the mail for me? PM me for the address.


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[KULTULZ]

Originally Posted by runmikeyrun

From what I know they’re known to fail due to the valve not being solid, but that’s just what I read on the interwebs

The HD ENGINE exhaust valves are hollow stem and filled with sodium. Once the engine reaches operating temp or above, the sodium becomes a liquid and transfers heat from the valve head/seat to the head via the guide where it is hopefully carried away by the coolant.

The sodium after a period will become caustic and attack the inner valve stem. The cap protects the valve stem (which is hollow and weak) from being beat to death by the rocker arm.

Same method used on the FE 427 MR.

[runmikeyrun]

I ponied up and bought one from Mummert. $20 min order.


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[KULTULZ]

Originally Posted by runmikeyrun

I ponied up and bought one from Mummert. $20 min order.

I was going to post a PN but thought you were covered -

-B5Q 6550-A-

You sometimes come across them on EvilBay.