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My 1937 Buick Special with a 1952 263 straight eight made the 2020 Bug Tussle Trek and the newly installed pcv system gets an "A" grade. Freshly washed engine had no oil vapor residue at all but did have a tiny liquid oil trail at the distributor gasket. Big improvement over the road draft tube. The weather was 103 degrees actual temp and 113 heat index with engine temp of 205* so the test was valid. Zero oil consumption over 250 miles so valve is not sucking any oil.

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