exh valve seals

Factory did NOT use valve seals on the exhaust. My heads are at the machine shop now and I noticed the guides on mine will need to be machined to accept the new valve seals. I'm not sure how you were even able to install the seals on your valve guides unless they are the wrong heads or someone before had some machining done? Confuscius once said, "if it ain't broke, don't fix it".

 

So I should just let them be on the engine??

They are probably intake seals everyone. It wasn´t easy too install them but not also hard. I had just too be patience

 

Well, you can leave them on, but understand that the back cut near the top of the exhaust valve is going to shred them to pieces. Where are those piece going to end up??? Think about it.

 

Damn.....now I´m confused
What do you mean buy "cut at top of exhaust valve" ??

Also. Why do they not have seals on the exhaust valve???

What the f... should I do??

 

If you had access to an exhaust valve, you would see there's a cutout (narrowed section of the stem) near but not at the top of the valve stem. It's for oil control, which is why there are no seals on the exhaust valves.

 

You need one of the these tools and you'd have the seals off in a snap.

 

The engine is still beside the car.
Can I reuse the headgaskets and headbolt when I pick the engine apart for dismanteling the wrongfully mounted seals???

 

No need to remove the heads

 

Turbo Dave is correct, get those seals off of the exhaust guides, the "notch" on the exhaust valve stem will tear up the seal, that is if the retainer doesnt smash 'em first.
The theory behind no seals on the exhaust guides is that the valve is not under vacuum (no oil can get into the cylinder) its only under exiting exhaust gas pressure, BUT, it doesnt always work that way.
I had seals installed on my heads, they cut the guides, AND installed new exhaust valves with NO NOTCH on the stem, just having the guides cut and installing seals wont work.

 

But if I do lift the heads. CAN I REUSE THE GASKETS AND THE BOLTS???

 

i would .. but i wouldnt pull the head for removal of seals



and fwiw every head ive seen that was cut for exhaust guide clearance to run a roller had the seals on exhaust side , thats how they come from champion on their ported irons

 

no exhaust valve seals = a lil smoking ? when rebuilt >?

 

Charlie,
Are the heads ported? Do they have Stainless valves? If the answer is yes to BOTHof these questions LEAVE the seals on the exhaust. The stock exhaust valves have a groove machined onto them that acts as an oil pump. It is tapered at the top of the groove and a sharp edge on the lower part of the groove. The lower sharp edge pushes the oil out of the guide (along with high exhaust pressure under boost) and the upper edge of the groove is tpered so it doesn't pull down the guide. If you have heads with stainless exhaust valves, then they must have machined the guide smaller and down for the needed clearance for the actual seal. If you installed seals over the stock exhaust guide they were NOT stock style intake seals, as they will NOT fit. You are probably OK as-is. use a air fitting in the spark plug and fill the cylinder with 90psi air. Use an external spring compressor available forn any autoparts store and pull the spring/retainer off. Take a picture of just one exhaust seal combo and post it. We can let you know what actions to take.
Here is a picture of a cut away section of both intake and exhaust valves in thier respective guides. You can see the noted groove on the exhaust valve. Hope this helps.

 

seals:exhaust guides?

Ken, I'm facing the same situat. I Have good, used stock iron heads at the machinist and I bought a set of new stock valves from TA Perf and was told they are stainless. No porting has been or will be done. Will I be OK to have the machinist do the necessary cut-fit on the exh. guides to have those valves work correctly?

 

Yes, IF the TA valves are the smooth stem versions. (no secondary groove under the keeper groove) Then they can cut the top of the exhaust guides down and cut the outside diameter for the seals. Should be an easy modification.

 

exh guides

I got the parts in today and the new valves do NOT have any grooves. Also spoke with Nick Micale and he said the same thing, no reason not to do the exh guides to install seals. He did mention importance of proper clearance on the cut guide. On the other board, in the "engine" tech, there is a good discussion on hyd roller lifters. Spoolfool2 posted pictures of three types of lifters. One in particular is the "v6 Buick Test. My new lifters came in today also and Tim from TA Perf. verified they are Morrel hyd rollers and they are shrouded. My concern is the total length of my new lifters compared to the pics Spool posted. His look somewhat shorter, but then again, I'm looking at a photo? Mine are just shy of 3 and 3/16" in total length. Any thoughts on this?

 

height of lifter doesnt matter its where the contact disc in the lifter is and on rollers its way down inside the body below the link bar

morels are taller from roller to the contact disc than comps

typically an iron head with more take approx an 8.050- push rod but things vary like deck block, gaskets, decked heads and roller rockers need different length then if you are on stock rockers


you need to install them and the heads with gaskets and measure for the proper pushrod for your motor build


before you install the lifters check each side of the pin that holds the roller and make sure they are crimped in place and the pin doesnt move ..