I have some pretty bad blow-by going on. I've noticed this for a while and its only been getting worse. I am pretty sure I have some worn rings or bad cylinder bores. When the car is up to temp you can actually see the gasses pouring our of the breathers.

I am slowly building a new engine. The current engine is a 305 and is better off in a junkyard. However, it still runs and drives fine aside from the power-loss due to crappy compression.

My question is....is there anything I can do to help the rings seal? I've tried putting Marvel Mystery Oil into the cylinders hoping I had a stuck ring....no luck. Would 20W-50 be a good idea? Would running 2 pcv valves do any good? I'm not really interested in a crankcase evacuation system since this is only a temporary solution and I would rather not hack into my headers. Any good ideas?

There is usually not much you can do, once the cylinders and rings wear they are stuck like that till you have the engine rebuilt. You could try putting a topend cleaner (mystery oil is just that oil, not a dedicated cleaner) and see if that can knock some of the carbon off the rings. But if the cylinders and rings are indeed worn you cannt really fix it from outside the engine.

Thats exactly what I had planned. I just came back from Autozone to pick some up and saw the most amazing thing. It was a product that claims it would cure even the worst case of blow-by. It was a jar of small beads you poured into your spark plug holes. It claimed to have a mild detergent and abrasive that would clean the rings, and cylinder walls. NOT!!! All they are are small balls of petroleum that do just about nothing other than cause a lot of smoke to come out your tailpipe.

I love seeing stuff like that, I put it right up there with Zmax.

hahahahaha
welcome to my world http://www.nastyz28.com/ubb/frown.gif

yea guy, i've tried everything...you're stuck with it til you rebuild the engine =\

------------------
Click here, it'll explain it all (http://memimage.cardomain.net/member_images/1/web/265000-265999/265597_11_full.jpg)