I have a '67 Fury with the 318 original engine. When I first start I get noticible blue smoke from the exaust, mostly from the left side pipe; not a huge cloud but visable. Afer running a minute or so it goes away. The oil consumption is not great. I was wondering about the umbrella valve seals. Would replacing these help this as I'm pretty certain that they are the originals (100,000 + miles). I replaced those on a slant six once but the seals didn't seem to stay down around the base of the valve stems. Also, do these 318 heads have return oil holes that can become plugged up? Thanks for any info.
John

Original seals will most likely be cooked and in pieces, unfortunately maybe starting to get into oil pickup screen. The oil drainback is good on small blocks. Go ahead and tackle the seals, hopefully they are within the spring still. Maybe tie the car up for a day or two and do chain and gears too.

Thanks for the response. When you install the valve seals how do you keep them from riding up on the valve stems? Shouldn't they stay at the base where the guides are? Thanks.
John

I think the new design ones are designed to stay down there better. If your valve guides themselves are worn, replacing the seals won't cure that, you'll still get oil past the valves. Eventually heads just need a full rebuild.

Are stock-type seals really supposed to stay down on the guide boss? I thought they rode up to allow a little oil to the guide, but shield it from most of the splash. Hence, "umbrella" seal.

just did mine

the intake seal will push down and around the valve guide and should stay down on there,but might ride up some

the umbrella oil seal for the exhast pushes down as far as the guide,as the valve opens the valve slides down in the seal,the seal will stay at the spot on the stem and will be fine

the 2 seals look diff from one another,the more square seal is for the intake and the mushroon looking one will be the exhast

it took care of my start up smoke on mine,but the valve guides were good shape

a piece of rope 2.5 foot long in the sparkplug hole and a KD tool spring compreser and was about 2 hrs...well 3-4 hrs...I had a few

doin it

Bsharp is correct, the intake one seals and should stay down on the guide so it does not suck oil/air

the exhast umbrella seal will ride up on the stem to allow a slight amout of oil on the hot exhast stem/guide to oil/cool the stem

but sheilds it from most of the oil splash,as long as the valve guide is good the oil will not make it to the combustion chamber

You can get either type of seal. the one that has seal fitting tightly around guide, or the older style that rides on valve stem, either will work.