302 Chevrolet Engine Build

Rich Biebel · 04-25-2021, 06:46 PM

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

04-25-2021, 06:46 PM	#1
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	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 __________________ Rich Biebel S/C 1479 Stock 147R