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Early V-8 Draft Tube

Surprise to many, the first Chevrolet V-8’s had a lower end draft tube just like the six cylinders of the same years.  The V-8’s are hidden between the distributor and the firewall and not in easy view.

The Chevrolet parts catalog for 1957 shows this “tube assembly” number 3726641 available by the dealer from 1955 through 1957.

From almost the beginning of the internal combustion engine, some type of venting of the lower crank case was needed. It was not until the early 1960’s that many vehicle engines were designed to pull the vapor from below the piston rings to be burned in the engines combustion chamber. Thus, much air pollution was eliminated particularly from well-worn engines, often referred to as lower end blow-by.

V-8-Engine-Instruction

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