Quote:
Originally Posted by 8door
This is a general inquiry about a new engine using oil.
I bought the new crate engine from a GM dealer several years ago and stored
it pending rebuilding my 68 C10. A year ago finally got it ( the truck)
put back together and installed the 350 with a Holley and an Edlbrook intake
stock dual pipe exhaust and fired by MDS electrics.
Did the breakin at 2000 rpm for 1/2 hour drained out the Lucus breakin oil
filled up with regular Valvoline 10-30 and hit the road. Runs great nice smooth power
through out easy rpm watching oil pressure and temps.
After about 100 miles stated driving at higher speeds, checked the oil level uhmmm down 1/2 quart so now that seems to be it's thing, 100 miles add 1/2 qt
Plugs are clean, but noticed blue smoke at restarts while engine is warm.
My first suspect is Valves ???? As of today I only have run it about 1800 miles.
I have read several other forums and comments that GM valve stem seals are a problem.
Any body else experienced this with new crates ?????
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No, but never knew anyone who let it sit that long; I agree valve stem seals likely the problem.
If that's a 350-290HP these are valve-seals listed on this link from GM. Not sure how old the crate engine is if the parts match.
10212810 8 Seal, Int Vlv Stem Oil
12564852 8 Seal, Exh Vlv Stem Oil
http://www.chevrolet.com/content/dam...e-12499529.pdf
You might try some "high miler" oil, it has seal softener in it. I put in in my 350-330HP and it stopped the oil cooler hose leak.