GMtechmatt

anyone re use stock pcv system with Fast intakes? or just upgrade to a catch can

Decadence75

iTrader: (17)

If you want to avoid oil in the new intake LS6 valley cover and a catch can.

AmarilloWS6

iTrader: (3)

^THIS I did this upgrade to my c5 with a FAST and I have no oil in my intake now and my catch can barely catches much of anything because of the ls6 valley cover. It cleans up the engine bay a lot too by getting rid of all of the crappy ls1 lines.

Cra-Z Larry

AmarilloWS6, in your first pic I'm guessing you unplugged the TB vac line just to better show the catch can routing?? Also if I switch to an 04+ ls6 valley on my 99 ls1 (has an ls6 intake) is there interferance between the block and pvc on valley cover?? Sorry OP for the hi-jack but he seems to know the deal on this!!

AmarilloWS6

iTrader: (3)

You're right, I was just trying to show the catch can routing better. On a 99 you will have to cut that little provision on your block, sounds scary but it really is way too easy, I wouldn't let that stop you. My car though, somehow has an 01+ block, I'm assuming the previous owner had the block replaced at one point, but kept the 853 heads, ls1 cam, and ls1 PCV system. Here is a thread I posted in this week answering all the questions you need to know about this swap. It cleans up your engine bay and keeps your motor cleaner as well!
https://ls1tech.com/forums/generatio...-pcv-help.html

Zlow28

iTrader: (11)

+2 on the ls6 valley cover. Im about to do one in a few weeks too, and its gonna help clean the engine bay a lot.

Heres what gets cut out


Just make sure you cover everything REALLY good. Also make sure you get the 04+ valley cover as amarillo mentioned. Part number 12577927

AmarilloWS6

iTrader: (3)

This is my block in my 1999 c5. The blocks without the provisions started in 2001, so I was pretty stumped when I saw that mine didn't have it, especially since it still had 853 heads, ls1 cam, and ls1 PCV. I wonder what happened to the original? lol

Zlow28

iTrader: (11)

^^^ lucky, i hope my car's previous owner did a block swap too lol

Same thing happened with my clutch. I bought a monster clutch only to find out i already had a spec clutch in lol

AmarilloWS6

iTrader: (3)

Haha I know! And the car was bone stock when I bought it too besides the block swap I guess? I love my Monster Stage 2 clutch! Good choice.

Cra-Z Larry

Great info guys, sorry I didn't get back sooner it's been a crazy week!! I remembered this from a friends project a few years back but wasn't sure what parts were used. Thanks for the help!!! Larry.