The Stovebolt Site Forums The Shop Area Engine Shop Put too much oil in rebuilt 250?

Hi glennj3 . . . here's my take about your engine oil . . . .


It really could be those two PCV valves - - Do you know IF - you have any type of "baffels" , inside , under those holes where your PCV valves are ? ?
I really don't think I'd use two PCV valves ! ! For my 69 (Nova) 250ci , I use the stock PCV valves & have a Baffel under the rear location. You need too remove the front PCV valve . . . my guess , would
be - your Oil usage - - is being "sucked up through that front PCV valve, and going into your carb. I'd install a new 'Breather cap' on the valve cover (a filtered type V/C breather. your PCV valve need too "suck the 'vapors' , out of your engine.
Too do that , you use the PCV valve at the rear port , and, a breather (filter type breather) , where you have the (non-breather) cap installed .
The engine will then : Breathe (in at the front breather (freash air in) ; and your (rear) PCV valve (hooked up to the rear carb vac port . . . works to "evacuate inside your engine" .

breath - in ; evacuate - out . (it can - not do that , using two PCV valves) .

Generally, when you remove the (sealed) V/C oil cap ; you may feel inside your V/C ............ and , I'd bet there is NO baffel , inside the front small hole ....... thus, the front PCV valve is causing your "missing 1/2 qt of oil" .
I sure would also check that there is a baffel under the rear valve hole .
For my 250 engine - I think I use a 16lbs rad cap. I'd buy a new radiator cap . I am also using the OFFY 4bbl intake & my stock exhaust manifold ; with the Holley 390cfm carb. I also am using an "Oil Catch Can" , between my rear PCV valve , and my carb port.

later , jim

ps - - I am using the " DF - 17 " pcv valve by : M E Wagner .