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SDT1DYI · 12-13-2020, 04:43 PM

A PCV " system" is best installed when your building the engine. As I mentioned, all the sealing surfaces of the engine need to be addressed. Then it's best to hook a vacuum pump up to the engine while it's on the stand. Draw it down to say 15 Hg. Then shut the vacuum off. Watch your guage piped into the engine vacuum area. Does it drop quickly? If it does then you have gasket issue. Valve cover gaskets are a good place to start. Once you know the motor is sealed up, your vacuum loss is ring seal......
It's a lot of work and helpful if your engine produces higher vacuum conditions , like in 2 barrel combinations

Steve Teeter STK/SS #620

12-13-2020, 04:43 PM	#9
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 406 Likes: 0 Liked 456 Times in 148 Posts	Re: PVC and catch can question A PCV " system" is best installed when your building the engine. As I mentioned, all the sealing surfaces of the engine need to be addressed. Then it's best to hook a vacuum pump up to the engine while it's on the stand. Draw it down to say 15 Hg. Then shut the vacuum off. Watch your guage piped into the engine vacuum area. Does it drop quickly? If it does then you have gasket issue. Valve cover gaskets are a good place to start. Once you know the motor is sealed up, your vacuum loss is ring seal...... It's a lot of work and helpful if your engine produces higher vacuum conditions , like in 2 barrel combinations Steve Teeter STK/SS #620