Which PCV Valve to use???

[Ace17]

Hey guys,

I've got a Vortec TBI build in progress, and I was wondering which PCV valve to use. I have an 1988 GMC sierra that I'm rebuilding, so I bought a new vortec 5.7 long block, and put a vortec/tbi intake on it. It's got a mild cam(comp cams xe258hr), 1.6 rollers, nothing too crazy. My question is, should I use the pcv valve made for the 88' tbi engine(FV184), or the one for the 96 vortec engine(FV178)? I had a friend tell me a while ago that using the wrong pcv valve on your engine can lead to leaking gaskets and seals, as it helps vent the pressure in the engine. What do you guys think, considering it's both vortec and tbi?

[1project2many]

You'll be fine with either valve. There's even a chance they're the same valve with the addition of a plastic elbow on one. Make sure the breather in the opposite valve cover is open because that's where any crankcase vapors that cannot be drawn into the PCV are vented.

[Ace17]

Okay cool. I was questioning how different the pcv valves would be, considering these engines aren't radically different from each other.

[PlayingWithTBI]

Take a look at this one

https://www.summitracing.com/parts/n...7779/overview/

[Ace17]

Wow, that pcv valve looks like it works for the tbi trucks, and then a few of the 1996(and later) trucks as well. I'm so confused, lol. I think I might just buy a few and try them all out

[LeMarky Dissod]

What the original poster suggests
in this thread
may not be overkill if your cam and either of those PCV valves are not in sync.

At a minimum, you may want to do some research regarding Part Number 12572717. Technically it's not a PCV 'valve'; it never opens or closes, because it's a fixed orifice.
Originally redesigned in 2003 to combat oil consumption in Gen3 GM V8s of all sizes, many LT1s, L31s, and even older GM V8s have used this PCV fitting with great success.

Hope either of the pieces of info in this thread are of some help to you …