Re: 302 Chevrolet Engine Build
A Road draft tube is what that was called and was on a lot of engines going back many years.
If you were behind an old car with one and they let off the gas coasting and their engine was a little worn, you’d see smoke trailing out from under the car from the tube. The idea was to create a little suction across the bottom of the tube to help vent the crankcase
They were pretty Sloppy and oil leaked out of there.
PVC systems replaced the RDTubes
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Rich Biebel
S/C 1479
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