327 Not Breathing Right?!?!

[fleetsidelarry]

Originally Posted by Slick67

That sounds like a good alternative, would it still allow the engine to breath properly enough to eliminate the sludge issue? Also, with the PCV valve on the same runner would it still have enough vacuum?


I have purchased the baffled grommets that can be installed on the rear of the valve cover, but that is a last resort. Although it seems that it would be easier and more effective than drilling into the intake at this point. This is what I purchased.
http://www.summitracing.com/parts/SUM-440332/
Attachment 802246

Slick67, you may have misunderstood Longhair, the hole he's talking about would not go into the intake runner, it would go into a place on the manifold that goes into the lifter valley. that's what I did on the tri-power.

[Slick67]

Originally Posted by fleetsidelarry

Slick67, you may have misunderstood Longhair, the hole he's talking about would not go into the intake runner, it would go into a place on the manifold that goes into the lifter valley. that's what I did on the tri-power.

Understood. Do you have a pic of where you drilled? Did you istall a PCV or some other attachment?

[fleetsidelarry]

Originally Posted by Slick67

Understood. Do you have a pic of where you drilled? Did you istall a PCV or some other attachment?

Slick67, yes I installed an inline PCV valve. I'm seriously thinking that the valve you were using is designed to thread into the oil galley something like the fitting I have below threaded into my manifold. if so, the manifold vacuum it was hooked to was actually pulling the valve closed and your system was building pressure. Am I making any sense? if that's what was happening, then you could use that valve (in the proper location), plumbed to the carb vacuum source and a regular breather on the oil fill.

Here's the inline PCV valve


here's the manifold location (this is just a fitting, not a PCV valve)


and the "vacuum source"


drawing from the oil galley has the drawback of not being baffled. I don't know if that's a problem as it would be with valve covers. and, as Longhair mentioned, in your case if you use the oil fill for the breather, you won't be drawing from the valve covers. it would still be better than no crankcase ventilation or the situation you may have now where manifold vacuum is apparently creating a low pressure situation.

[Slick67]

Originally Posted by 67cheby

these are exactly what i was looking at in JEGS to use on mine, and just put them at the very back , run one of the square breathers turned sideways ?? just what i was thinking of doing

I picked mine up from Wild West Rods on eBay for $15 bucks each. So if you are still thinking this direction is right for you here is a way to save a few bucks!

Originally Posted by n2billet

When you drill into the back of the v/c's make sure these don't stick to far in and hit the rocker arms or lifters. I had to make mine shorter than I wanted to because of this issue. When I made my tubes (for the v/c's) I built two baffler in each to try and keep the oil from slinging up into the tube but still allow air movement. I also built a "catch can" type box to house the pcv and the breather. In theory my motor should pull in air from the old oil filler tube (it's been modified) and from the breather and the pcv "should" pull the fumes....should. I've only had it running for a little while and I'm still working the bugs out (other issuse not related) so I will report back after I get some miles under her. Here's some pics of what I did....

I am going to measure to make sure before any cutting happens. That is a really cool settup you have there! This is starting to sound like I may have cured the problem with the vacuum by rerouting the hoses, but now I need fresh air. Eventually this will all be clear to me and correctly done.

Originally Posted by fleetsidelarry

Slick67, yes I installed an inline PCV valve. I'm seriously thinking that the valve you were using is designed to thread into the oil galley something like the fitting I have below threaded into my manifold. if so, the manifold vacuum it was hooked to was actually pulling the valve closed and your system was building pressure. Am I making any sense? if that's what was happening, then you could use that valve (in the proper location), plumbed to the carb vacuum source and a regular breather on the oil fill.

Here's the inline PCV valve


here's the manifold location (this is just a fitting, not a PCV valve)


and the "vacuum source"


drawing from the oil galley has the drawback of not being baffled. I don't know if that's a problem as it would be with valve covers. and, as Longhair mentioned, in your case if you use the oil fill for the breather, you won't be drawing from the valve covers. it would still be better than no crankcase ventilation or the situation you may have now where manifold vacuum is apparently creating a low pressure situation.

I think the settup you have is essentially what I have. The engine does not seem to be building up any pressure since I rerouted the the oil filler hose to the carb and it seems to run better. But I have to see what is happening with my settup first.

[67cheby]

i was looking at my speedway catalog this morning and i noticed , Offeanuser (sure i didnt spell that right) has a breather that mount to the side of your valve covers and comes up looks pretty cool i think but $75 bucks apiece

[Slick67]

Originally Posted by 67cheby

i was looking at my speedway catalog this morning and i noticed , Offeanuser (sure i didnt spell that right) has a breather that mount to the side of your valve covers and comes up looks pretty cool i think but $75 bucks apiece

Ouch. That is a little TOO pricey. This is just another opportunity to be creative and come up with something cool that noone else has. I am not seeing any signs of leakage since I rerouted my vacuum from the oil filler to the front of the carb. This seems to have resolved the issue, maybe not for good but I will be keeping a close eye on all of my gaskets and running it very little for now.

[lil hoodlum]

I understand you don't have the hole for the road draft provision anymore but here is a pic I found off of the web that someone had done for their 283 with stock valve covers. I wish I had more information.

Keith