should all valves have umbrella type valve stem seals?

[340plot]

i started to take my heads apart to reseat the valves, but to find they have been done, along with new seals. but, on both the intake and exaust valves, it has the umbrella tpy. they are on on tight, just kind of hangs there!.lol is these normal?

 

[Mopar44134]

yup. short ones on the exhaust...longer on the intakes..

 

[Prine]

the exhaust valve seals on a small block look like a umbrella and are suspended on the valve stem, the intakes fit onto the guide and dont move....so NO, not all umbrellas.

 

[340plot]

ok, one to one. so i guess the next one replies will win!.lmao

ok, when i took off both a intake and a exaust valve, they both lifted off easily. none is like tight onto the guide metal area...........................

 

[Prine]

No, " I " am right......

http://www.hawkinsspeedshop.com/mopar-performance-parts/images/p4120492mopar116.jpg

What did I win?

 

[340plot]

here is what all of mine look

 

[Prine]

Those are intake valve seals.....

 

[340plot]

so, since they used these on all valves, will it hurt anything? as i have read some guys do not run anything on the exaust valves at all

 

[Prine]

The white ones in this pic:
http://media.photobucket.com/image/recent/ROGERSPERFORMAN/P1160114.jpg

are RACE type and require valve guide machining....but offer added clearance when running High Valve Lift.

 

[340plot]

so, will the ones on the heads now be okay?lol

 

[Prine]

Theoretically yes they will work, but...........your not getting a Go-Ahead, or approval from me....cause I go OE or the right way the first time.

 

[340plot]

ok, so, now that you say that, i bought a gasket kit from advance for this engine,a nd i just looked in the bag, and all 16 are the same. maybe it is a eroor on the stores part?

 

[Prine]

And those Intake Seals push down on top of the valve guide and kinda snap into place.....loose and floating wont cut it....the exhaust umbrella seals float on the stem and shield the top of the guide from "oil flinging onto the valve and running down the guide and causing blue smoke on crankups and eventually seizing the valve from carbon deposits".

 

[BillGrissom]

There was a better style intake seal that did not require machining. I recall late 70's small blocks. However, I was unable to get those. I ended up using the umbrella type on both intake and exhaust, as shown above. Indeed, I got a spare set since I thought I was ordering the former from Autozone (based on photo and year), but received the umbrella type. That is a common problem, you order and it is a crap-shoot what you get. Rockauto seems best in showing what you will really receive.

Re will they work. Sure, they were the original design. What probably matters more is how tight the valves are in the guides, especially the intake where oil can get sucked in and give a puff of blue smoke when you leave a stoplight.

 

[Prine]

look closely.....I just did this same job, thats why I am fresh on it....and MY Gasket set came with both kinds in ONE BAG....8 intakes, 8 exhausts.

 

[BillGrissom]

I should mention that both of the 2 small-block gaskets kits I got had the umbrella type. One had different sizes for intake and exhaust and in the other all were the same size. You can use exhaust ones (larger) on intakes, but not the other way since the exhaust ones are for higher heat (recall reading).

 

[krazykuda]

It depends on how the machinist set up the heads. My head guy uses the style pictured in post #6. He machines the heads so they will fit on all 16 because he believes that they seal better than the umbrella type. He has been doing this for years and I trust what he says. He gives great head!!!

 

[green1]

Been working on small blocks since 1970. Small on exhaust, taller on intake (due to vacuum). No snap. Last set of complete gasket set from Fel pro had both kinds.

 

[340plot]

well, i had advace order me just valve seals last night, and got 8 of each, but in the complete kit i bought, it had 16 of one type. same company! felpro

 

[RustyRatRod]

They are different because the exhaust valve needs some cooling and lubrication. Those seals are designed not to be perfect seals. At least those that do not fit tight around the guide like factory ones are. The first and second generation Hemi, for example. They did not come from the factory with exhaust valve seals. Some of the early Hemis had them on neither. Look at the angle of the exhaust valves on the early and second generation Hemis. Oil would have to flow uphill to run "down" the exhaust valve stem into the combustion chamber. Also, if oil does go down the exhaust valve stem, it will not get burned. It simply gets blown out of the exhaust port.