Engine Mechanic Says Sticking Valve Guides

Ok. Couple of things. First, are the rockers adjusted too tight? Correct length pushrod? What kind of swipe is there on the valve stem tip? If the valve train geometry was not right then that would cause premature/excessive wear on the guides and seals, but IMO you would see more oil consumption and smoke. Are the valves noisy? What was your compression reading in all 8 cylinders?

Second, did he say valve seal or valve guide? Valve seals can be replaced with the head on as they are on the valve stem under the spring. Valve guides are what the valve stem rides in. The only way to replace/repair them is with the head off.

That being said, If these were brand new in the box TFS heads and the the seals or guides are faulty, I would not be paying for any work. I'd be on the phone with TFS. On olderTFS heads, they had problems with the valve guides but I haven't heard of that problem in years.

Valve seals are certainly not the problem, I have no valve seals on all of my exhaust valves and have no trouble. I have never seen a problem with TFS valve guides with a head new out if the box. I personally think your issue is somewhere else..

First pull your valve covers and rotate the engine by hand. Check and see if the valve-train looks like its running smoothly.

I may be wrong but I suspect shenanigans. I did a quick search of this specific issue with tfs and cant find much.

I may be wrong. I went back and read more of the thread. I missed some stuff.

I also haven't had an issue with them out of the box but the only way to know is pull them.... before any work is done to the head is personally call and talk to TFS. They will stand behind their product but maybe not once you take them apart......

TFS uses a good Vinton valve seal....

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To the OP, if I were to guess, I would say something went wrong in the install. I agree with Rick. Have you called TFS tech yet? I would do that before proceeding any further.

if you have a burnt valve it would pop..you could put your hand on the end on the tail pipe and it would suck on it...i would do a visual with the v/c off and running

you need to go over your rockers again and lossen them by a 1/4 turn to start..do you have the right push rods for heads?

Have you called TFS about this issue and told them what the mechanic said- the brand new heads had sticking valves?

A local mechanic with experience in the performance fox body game diagnosed it with sticking valve seal guides. He said that sometimes in new heads, the valves heat up in such a way where the guides fuse to them and they won't seal properly.

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Sounds like there is more to the story here.