Breather like an oil filler cap?

[COKE]

I,m using a K&N breather in place of the oil filler cap(Well, the engine had it when i bought the car)
It means that i have the crankase valve connected to the air filter  on the rigth valve cover and the breather on the left.
I have read that is not suggested for that use.
Should i get an oil filler cap better?

Thanks!

[John_Kunkel]

You didn't mention what year your car is but if it originally had a push-on breather type filler cap on the left side, the K&N will serve the same purpose. This is called an open pcv system.

If the left side originally had a twist-in filler cap with no breather it's called a closed pcv system; your current setup will also work with it.

[Nacho-RT74]

69 R/T

[COKE]

Is a 69´ with a 70´440.
The valve covers are from Direct Connection .
Thanks.