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Howdy, I have a 1974 Chevy C30 with a big block 454 that has a mild cam. My timing is set to 4 degrees before TDC. It has 16 inches of mercury for a vacuum reading at idle when at operating temp. The spark plugs are all burning evenly and with no signs of oil, lean condition, rich condition, etc. The motor has 89,000 miles on it and was rebuilt some time ago before I owned the truck. My question comes to play when I removed pcv hose from the carburetor to take the vacuum reading. all of a sudden some slight wisps of white smoke…more like steam came from the valve cover breather filter on the other side. As i remove the pcv valve to see if its the same on the drivers side same thing. When I rev the motor up from idle, this steam/smoke puff increases and then let off throttle it dies back down to a trickle. I put the pcv hose back in the carb and it goes away completely WOT or not. Motor makes no bad sounds and does not overheat, has great oil pressure(25-60 depending on rpm), and does not stall out at lights or bog down at all(this is a manual trans Muncie 465). Is this normal blowby?
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