Second Round Valve Stem Seals...

[tortuga]

Originally Posted by Jerry Clayton

can you wiggle the valve stem in the guide?????????If the guides are history, no amount of changing seals will help

They do move in the guides, some more than others...Not crazy but you can definitely feel it by hand...Didn't want to get too crazy wobbling a valve being held up by air pressure...

Guess the heads are coming off at some point.

[Gaz64]

Originally Posted by tortuga

They do move in the guides, some more than others...Not crazy but you can definitely feel it by hand...Didn't want to get too crazy wobbling a valve being held up by air pressure...

Guess the heads are coming off at some point.

Placing the piston at EXACTLY TDC allows you do open the valve off the seat to feel the guide.

I would have bronze guides fitted to tighten the clearance up.
The valves will seat more reliably, the engine make more consistent power, less likely to break a valve head off, and the valve seals should work better.

[tortuga]

Originally Posted by Gaz64

Placing the piston at EXACTLY TDC allows you do open the valve off the seat to feel the guide.

I would have bronze guides fitted to tighten the clearance up.
The valves will seat more reliably, the engine make more consistent power, less likely to break a valve head off, and the valve seals should work better.

They are bronze according to the literature, just a bit over honed i think...

[Gaz64]

Originally Posted by tortuga

They are bronze according to the literature, just a bit over honed i think...

A good guide should be a barely perceptable feeling of sideways movement with the valve head off the seat. Bronze guides can run tighter than cast iron.