Blue smoke, particularly on startup., is a sign of worn valve guides. Seals will be a temporary fix, but once a valve starts wobbling around in a guide, it will wear out a seal in a hurry. The "positive" guide seal that grips the guide and the valve stem will do a better job of oil control than an umbrella seal or an O ring. Some positive seals need a machined spot on the OD of the valve guide, while others are just a snug slip fit over the machined guide. Perfect Circle makes both types, but you're going to need to find a parts man who knows how to read a size chart, and some good measurements of the guide and the valve stem to get the right part. Nose-picker computer jockeys at the big box do-it-yourself parts stores need not apply!
Jerry
