p38 Thor vlave stem seals

[peter51]

Received valve stem seals in a VRS kit. Some of them have a secondary black seal inside whereas others are just standard.
Can anyone one tell me whether the inside of the stem seal should have another black rubber seal imbedded in it.

[Hoges]

The VRS kit has extra bits and pieces to cover most versions of the Rover V8. IIRC the black insert has just popped in there by 'luck' . Suggest others may be able to explain confirm orotherwise. When I had my heads refurbed, the engine builder made a point of not putting any stem seals on the exhaust valves, just the inlets, to minimise carbon build up and other deposits. check out pics here http://www.ebay.com.au/itm/like/120663856484?limghlpsr=true&lpid=104 shows two different types for different engines.