Are Teflon Valve Seals, Ok for a Street engine? Good for both Intake and Exhaust?

Skip the teflon and use viton seals on anything that needs a seal.

From what I understand they are too good & on a street eng would deprive the guides of almost any oil. Strip different story.

Thanks for the replies. I found a dusty set of (16) Mopar Performance Teflon Valve Seals still in the original shrink-wrap.

Thought I'd use a couple on the AMC 304 V8 in my CJ-5 Jeep as cylinder #7 is burning oil. Did a compression check and the cylinder is Ok / same as the other seven cylinders.

Could be an intake manifold leak, bad oil ring, scored cylinder, etc.

I have some Standard cup-type oil seals and I may have some leftover Viton seals in my gaskets collection.

I received a suggestion to try to squeeze Two oil seals onto Cylinder #7 valves and see if that "fixes" the problem.