Quote:
Originally Posted by chiphead
Do not pass go, do not waste time on a leakdown, pull both heads and CC the chambers. A leakdown may help confirm condition of bottom end, but I don't think it's the root cause of what's going on here. It would appear that one head got milled and one didn't. Where did these heads come from?
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Quote:
Originally Posted by PontiacHO
Run thru the valve adjustment first just for eliminating the valves too tight on one side. Run a compression check again on that weak side. If that doesn’t reveal anything (and it probably won’t) you’re on your way to removing the heads anyway.
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Quote:
Originally Posted by Schurkey
Pumping compressed air into the cylinders without a leakdown tester is ABSOLUTELY FINE for testing valves, head gaskets, and looking for cracked castings. Because the only acceptable result is ZERO leakage past the valves, into an adjoining cylinder, or into the cooling system.
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Ok this is what I found out with the leak down test. Air is coming out of the valve cover breather on the Driver side but not the Passenger side. From what I am reading, that would be worn piston rings, correct?
A while back, I do remember seeing surface rust on steel components when I took off the valve cover. I was thinking a little bit of water must have seeped through the valve cover gasket when I degreased the engine compartment. I wonder if surface rust developed on the piston rings and cylinder, ruining it. However, I do not remember the engine producing much more power before washing the engine either.
I will never understand the engineering of Pontiacs poor valve cover design with the 4 bolts. I always had issues with sealing them to prevent oil coming out.
Quote:
Originally Posted by tom s
Are both heads 6500?Tom
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Yes, I just confirmed both sides say 6500