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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2011 Posts: 2,951 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 2,951 | I beleive the way I have my rocker cover set up is correct, but I'd like confirmation from those who really know. I have a 1971 250ci engine in my 1965 C10. The engine was essentially free to me because it came inside a 1966 parts truck I bought. It runs very well. To keep the engine bay looking like a 1965 230ci, I removed the 1971 rocker cover and replaced it with a 1965 cover that has the Chevrolet script . These photos are of the same 1971 engine but I've obviously done some work. The 1971 engine rocker cover has a fresh air intake on the left side just below the oil fill cap (black non-vented oil fill cap in photo). The 1971 cover has a PCV at the rear. The 1965 cover does NOT have a fresh air valve on the side like the 1971, so I am using a vented oil fill cap. The PCV is the same. Hambone has a thread discussing his rocker cover and this propmpted me to ask about mine.  | | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Should work fine. The vent tube to the air cleaner may have slightly cleaner air than the air coming through the mesh in the vented filler cap but not much.
Evan
| | | | | Joined: May 2007 Posts: 1,718 Moderator: 60-66 Trucks; North Eastern Bolters | | Moderator: 60-66 Trucks; North Eastern Bolters Joined: May 2007 Posts: 1,718 | Lugnutz, Thanks for the asking again. I am keeping track of replies for my education and the pictures are worth lots of words.
BTW - That 250 looks nice.
HB | | | | | Joined: Feb 2004 Posts: 29,851 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,851 | It's been a while since I've had a second-generation six apart, and the weather is too raw to go out to the shed and pull a valve cover today, but I seem to remember sort of a baffle near the midpoint of the cover that routes incoming air toward the crankcase, and helps the PCV valve create a down/up air circulation. Like the old country song says, "I've been wrong before", so don't take that as gospel. The older systems with the road draft tube did the same thing by creating low pressure at the end of the tube above 30 MPH, and drawing air into the valve cover with slots or other venting methods.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2000 Posts: 5,228 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,228 | Looks good to me also, lots of engines use the mess type breathers. Look for a PCV valve with a 90 degree outlet, it will keep your hose close to the valve cover for a much cleaner look. Most all PCV are the same, just shop around.
Joe | | | | | Joined: Dec 2014 Posts: 72 Shop Shark | | Shop Shark Joined: Dec 2014 Posts: 72 | As long as you run pcv and have an oil fill hole with an oil breather you'll be fine. | | |
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