I posted a question about blowby on a fresh 383 rebuild and thx for the replies again. i drove the car using the engine braking technique and tried to keep a load on it, but still have what i believe excessive blowby or crankcase pressure. i have a good pvc on one valve cover and breather on the other. i aslo have a old school oil fill on the front of the intake and blew the cap off of it due to high crank case pressure. i retuned it, adjusted the valve lash, did a compression test and all 140-150 psi, and the plugs equally good. The only thing i can think it could be is the exhaust crossover in the intake causing exhaust to enter the gallery. i have a old Offery 3 two intake with exhaust resistors. anybody every heard of this and how can i check it?? Is there anything else that could be causing white puffing oily smoke out of the breathers?? also iam not losing water but could it still be a head gasket leak??? thx agian............
i think you have rings that are not sealing properly should do a leak down test, or plug an air source into each cylinder with the valves closed and listen if you hear more air getting by the rings on one cylinder or more.
Thx i think your right. i did another compression test and #6 and 8 were only about 90 psi. and could hear air leaking into the crankcase telling me rings. i then squirted a couple of drop of oil in the hole and it pumped it up to about 110 psi. i hate to run it and damage it any more, but also hate to pull the motor and find that the rings have not broke in yet. any advice???
How did you loose 50-60 psi on two cylinders, your first post in this thread said all cylinders were at 140-150 and the plugs looked good? You are bound to get answers and opinions that send you on a wild goose Chase or a bigfoot expedition. If its your testing equipment, get new better stuff. If its your method, be more methodical. If you measured ring gaps and hone dimensions during assembly the same way and with the same type of equipment that you did this compression check id say that you need to tear it apart. Two cylinders 30% lower than the rest is a big problem and generally constitutes a tear-down. I also looked for your questions in the other thread you mentioned and didn't see or find them here: http://www.jalopyjournal.com/forum/search.php?searchid=15599280
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