Gen5 pcv hookup question

[87chevy.com]

Not many have done l83 swaps, but for the ones who have how are you connecting the 2 ports on the valve covers?

Just 2 filters on em?

I was thinking connecting them together and run them to the intake tube somehow.. or could you connect them to the unused purge valve port? Been looking online and again, no answers..

[mongocanfly]

how are they run in the original truck?...pics might help

[kazoocruiser]

I think if you just run filters on them you are going to hate the underhood smell every time you decelerate and crankcase vapor is highest.

It's better if you can tee them together and port it to manifold vacuum, which is highest during deceleration, and will help purge the sump.

[87chevy.com]

Stock runs both hoses to the intake tube.
Aftermarket intakes has a bung welded to them, no baffle from the pictures I've see.

I'm gonna play around with some scrap 1/2 hose and run it to the purge valve port... see how that works if not just weld a bung to the intake tube and run the hose there

Clint

[mongocanfly]

I'm pretty sure on the older setup the fresh air side (passenger) is metered... the otherside (driver) is not...
Jonathon (dayj1) will know...he explained it to me but I cant remember the exact....something about the engine thinking it has a vacuum leak...
So I'm thinking your fresh air side should be before the throttle and the other side after the throttle...
If it was originally in the intake tube I'd put it back there in your new setup..

[87chevy.com]

Originally Posted by mongocanfly

I'm pretty sure on the older setup the fresh air side (passenger) is metered... the otherside (driver) is not...
Jonathon (dayj1) will know...he explained it to me but I cant remember the exact....something about the engine thinking it has a vacuum leak...
So I'm thinking your fresh air side should be before the throttle and the other side after the throttle...
If it was originally in the intake tube I'd put it back there in your new setup..

Hope he chimes in.. they both go to the massive stock air intake tube, aftermarket look like it's just bungs so neither setup could measure the air flow... or that I can see how anyway




Dont pay attention to the fan relay, its temporarily.

Not bad for Mickey moused together with scrap stuff, but no dice. Way to much vacuum on that port without a restriction, I could barley remove the oil fill cap. Too much vacuum like that will damage seals .. I might grab a 3/8 bolt and chuck it up in a drill and cut off the smooth part and start with a 1/8 hole and make a restrictor, but may just order some bongs online. This looks way to good to work..

Clint

[sprint_9]

The two ports in the valve cover on those engines are fresh air in, dont connect to the purge port which is under vacuum. You have no ventilation occurring or very little because the entire pcv system is under vacuum.

Those two ports go to your intake tube, like stock, but it doesnt matter if you tee them together like you have them, as long as they arent under vacuum, so put them before the throttle blade. The vacuum side of the pcv system comes out by the front of the cam and runs up to the middle of the drivers side of the intake.

[87chevy.com]

Originally Posted by sprint_9

The two ports in the valve cover on those engines are fresh air in, dont connect to the purge port which is under vacuum. You have no ventilation occurring or very little because the entire pcv system is under vacuum.

Those two ports go to your intake tube, like stock, but it doesnt matter if you tee them together like you have them, as long as they arent under vacuum, so put them before the throttle blade. The vacuum side of the pcv system comes out by the front of the cam and runs up to the middle of the drivers side of the intake.

Gotcha thanks, found some aluminum barbs on ebay, gonna give them a try

Clint