327 Not Breathing Right?!?!

[fleetsidelarry]

I had another thought. If the PCV valve you have (had) is made to function opposite how it was installed it would explain why the cap blew off in the first place and why the current set up runs better.

I ran into this when trying to fit a system to my tri-power intake.

[oldblue1968chevy]

I saw a truck today at a show

They had the PCV port from the carb going to a port on the oil filler (that went into the lifter valley thru the intake manifold)

[Slick67]

Originally Posted by oldblue1968chevy

I saw a truck today at a show

They had the PCV port from the carb going to a port on the oil filler (that went into the lifter valley thru the intake manifold)

I have seen those, but I don't know if that will pull enough pressure. It seems like a hit and miss thing going on with each new way of doing it. If anyone has this settup, please let me know more about it!!!!

[oldblue1968chevy]

ive seen it more than anything

CUT THE VALVE COVERS AS A LAST RESORT! Keep trying!!!

[Slick67]

Originally Posted by oldblue1968chevy

ive seen it more than anything

CUT THE VALVE COVERS AS A LAST RESORT! Keep trying!!!

I don't get it. I have an oil filler cap hooked directly to my carb and it still isn't enough. Maybe a oil filler tube with the pvc hookup and run that to the back of the carb while still running the cap to the front? That is double the suction and may work.

[Slick67]

Tried everything. I also put my old Edelbrock vc's on yesterday and covered the hole with a peice of cloth......it works perfectly. The vc breathers I have decided to go with are the So Cal 90 degree side mounts....thanks 67cheby. They look the best. After all the research it seems that this is the only real solution and the install can be reversed with a little welding if someone wanted to remove them and fill the holes on the vc's. They will be mounted at the end of the vc's closest to the firewall. So now I need to get rid of the baffled air breather inserts in pic 2.

[67cheby]

i hope it works so i can do the same thing !!

[Slick67]

Originally Posted by 67cheby

i hope it works so i can do the same thing !!

It will. The other baffled insert called for a 1 3/8 hole to be cut and that really didn't work for me since I am putting them on the ends. If they were on top of the vc it woulda been done already. I'll keep ya informed on how everything works out.

[Slick67]

Gotta update this thread. This is how I tested to see if I was getting enough pcv. It seems to do ok. I have not had the truck above 25 miles per hour, but I didn't see any oil coming from anywhere. Hopefully it will continue to operate this way under regular driving conditions. The breathers come in tomorrow so I will have to do the last thing I wanted to........drill holes in the valve covers. The holes are small and can be patched so I don't feel too bad about it.

[Hubscrub]

i hear ya on cutting them but if it will make it "more right" its worth it to enjoy it.

[fleetsidelarry]

slick67, what is under the yellow tape on the valve cover closest to the firewall?

it looks like a hole in the valve cover. or are these just temporary valve covers?

[67cheby]

where is your pcv ?

[Slick67]

Originally Posted by 67cheby

where is your pcv ?

What pcv? I am pulling from the oil filler cap which I have been told by several very savvy engine people that my setup is more than adequate for proper breathing. Still not feeling the warm fuzzies when I see a little oil at the front of the manifold. When I say a little oil, it is just a drop if that, but still it bugs me. Could that be from my previous issue and now the gasket is leaking just a tiny bit?!?!

[Slick67]

ttt

[jlsanborn]

I know this is little old and you've already installed valve cover vents but I thought I would share in case anyone else stumbles across this in their searches.

I also have an early 327 and will also run the script valve covers. Fortunately, I have the block mounted PCV connection. If I didn't, I would drill and tap the back of the intake manifold and fab a baffle to keep oil out. By simply installing vents you've eliminated the crankase pressure that would lead to oil leaks but you have not provided any fresh air circulation to combat the sludge issue. Ideally you'd want fresh air entering one side or one end of the engine with the exit being opposite. I would also suspect messy oil film/mist around your vents as they are the escape way for all the crankcase gasses.

EDIT- Just noticed that you do have a connection to vacuum, but no PCV? I'd think that would be drawing a lot of air (most probably right from the vented filler cap) giving you a lean condition?

Nice truck man!

[Slick67]

Originally Posted by jlsanborn

I know this is little old and you've already installed valve cover vents but I thought I would share in case anyone else stumbles across this in their searches.

I also have an early 327 and will also run the script valve covers. Fortunately, I have the block mounted PCV connection. If I didn't, I would drill and tap the back of the intake manifold and fab a baffle to keep oil out. By simply installing vents you've eliminated the crankase pressure that would lead to oil leaks but you have not provided any fresh air circulation to combat the sludge issue. Ideally you'd want fresh air entering one side or one end of the engine with the exit being opposite. I would also suspect messy oil film/mist around your vents as they are the escape way for all the crankcase gasses.

EDIT- Just noticed that you do have a connection to vacuum, but no PCV? I'd think that would be drawing a lot of air (most probably right from the vented filler cap) giving you a lean condition?

Nice truck man!

Thank you!!! This is the type of info that I was searching for. So I do have a lean issue but it is very slight. The oil looks good so that leads me to beleive that just a slight change in the routing of the vacuum lines may do the trick. Although the truck runs fine it does bog on quick acceleration, but not too bad.

I am going to look closely at all of my alternatives and pursue the best option.