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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2009 Posts: 52 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2009 Posts: 52 | Does anyone know the original configuration used to ventilate the crankcase of a 1965 283 engine? I am currently in the process of having the motor rebuilt and when i took it to the Machine Shop the Technician notice that there was what looked like an after market "plug" in the top rear of the block just behind the distributor. He stated that this hole used to accomodate a "Crankcase Vent Tube" or another name was a "Road Draft Tube" and was used to properly ventilate the crankcase. He stated that without proper ventilation the motor would most likely have oil leaks due to too much pressure. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | if the road draft tube is plugged, it should have a tube in the plug that allows connection to a port under the carb - that type of PCV setup was an option and you should find details in your shop manual, as in the 55 manual here - in Cali it was likely standard equipment by 65 Bill | | |
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