Thread: 327 bad rings? has new heads!

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Originally posted by csf03716
mike, without a positive way of puttin a vacumn on the system and relyin on atmosheric ventin, what are ya gonna do when the ambient pressure is greater than the cranckcase?..the crank case has to be at a negitive pressure to work efficiently!...you should know that!...how many engines came into your shop with clogged pvc's and every gasket leakin oil past because they were pressurized? and not under sufficient vacumn.......

you are 100 % right in what you just said, the only dif. is with the pvc system, its a closed system meaning the pressure is circulated from the pan through the intake back to the pan again and if any of it gets stopped up it cant work, so it blows the oil out of the motor, but you could have pulled the pcv valve out of the valve cover pluged it off at the carb and put in a breather cap and it would have worked fine. it just wouldn't pass the smog test

ps the pressure in the pan is blow-by from the rings.