76olds

I took my original oil cap off a few years ago. I put a push in type Edelbrock Breather type of part in its place. Its vented, is this OK or should I be putting the original oil cap on the oil fill tube? Will it hurt anything leaving the push in breather in its place?
Thanks
Eric

coppercutlass

I ran one in the fill tube for years no issues. I did this because i didnt want to knock out the holes in the M/T valve covers.

76olds

Thanks Copper!! I wipe some oil residue off around the bottom of it each time I decide to clean the other chrome engine parts. Good to hear it isn't an issue so I'll leave it on.
Cheers
Eric

oldcutlass

Do you have a PCV in one VC and a breather in the other. If so then you can put the cap back on your filler tube.

76olds

I have both PCV and Breather. PCV on one cover and breather on the other. I will smear some silicone over the vent holes and plug the centre hole on the breather type cap I have in place. That will seal it up.
I didn't know it would have an effect on things.

coppercutlass

I run no pcv. If you are going for stock what old cutlass said is fine. Many guys plug the oil filler tube with a freeze plug. Very common. But many guys also run breathers on em. . Just depends what your taste and use is.

76olds

I will plug it up. It sounds like the I have too much ventilation haha. My taste is chrome, but the chrome oil fill caps don't do it for me. I'll silicone the Edelbrock breather up, won't see the silicone anyway.
Cheers

jpc647

Not sure you can have too much ventilation. These old motors do have a lot of "blowby".

BlackGold

Oh, I don't know. I've seen a few crankcases which have been ventilated by throwing a rod through the side. I'd call that too much.

oldcutlass

If you have too many openings you lose the positive ventilation. The PCV draws a vacuum so you can pull air through the vent on the opposite side of the engine.

jpc647

Haha, well yeah, that is true. In super extreme circumstances, lol .

76olds

Put-er-ther guys!! Thanks for the advice. I smeared some silicone on the vent holes under that breather, also in the centre hole. So I'd say ther is not ventilation getting in through my oil fill pipe now.
I also put the ground wire back on from the fire wall to the block that I took off a couple years ago lol, thanks Oldcutlass for the advice on that one too!!.

Cheers
Eric