jsut

i got a 99 gmc wit a lq4 6.0 stock, i want to swap my stock valley cover to the better ls6 one cause for less oil consumption, my truck got 217,000 miles on her

the question iam asking is when i do the swap do i need to cut the block lik the older ls1, i heard on the lq4 u didnt,

also, can i use my stock coolent vent lines, or do i need other ones, if so which ones n part #

can i use my stock vortec intake manifold, without any clearines issues, valley cover bolts??

and last how to run the pcv system,

let me know if i misssed anything, thanks

i know got alot of question, but i just want to know, thanks

jsut

anyone, gonna change my knock senors n i was thinking of doin it while i got the intake off, lol

01ssreda4

iTrader: (96)

I dont think the truck blocks need to be cut. However, I just did this swap and it resulted in excessive crankcase pressure which caused oil to blow out of the rear main seal. I left the stock LS1 PCV lines in place. The fix was LS6 valve covers which have the 2 rear ports blocked off. You do not need PCV lines with the LS6 set-up. I would recommend you do the same or block the ports off your existing valve covers to mimic the full LS6 PCV system, not just one part of it.

danbo313

iTrader: (8)

you get that valley cover swapped out??

NitrousLS408

OK question, if i have a valley cover with no knock sensors, I should be able to install a PCV valve in the front of valley cover, and the hose should be routed from the PCV valve to catch can, then out catch can to intake, is this correct?

01ssreda4

iTrader: (96)

You mean a gen4 cover?

lowerthanyou00

iTrader: (8)

Ls6 pcv valley cover fits perfect no modifications needed. Gen 4 doesn't fit due to oil pressure sending unit. New gen4 blocks are flat all the way back.

smokenssz

iTrader: (24)

Just so I understand..... for the LQ4 block buy the gen 3 ls6 pcv valley cover and not the gen 4 valley cover and there is no cutting or fitment issues on the iron block?

JRENIGAR

iTrader: (37)

Correct, I have an 07 LQ4 block with a 2nd design ls6 cover on it with no fittment issues. I also bent the stock ls1 steam lines to fit around the pcv nipple and was able to use them with the ls6 cover. I wanted to vent all 4 corners of the heads anticipating installing a procharger to hopefully help keep it alive.

smokenssz

iTrader: (24)

Awesome! I don't know what year my lq4 is but that's good to know. I appreciate the info!

2001AntiVenom

iTrader: (84)

I have been talking to Mighty Mouse and he said with his catch can you don't need the ls6 valley cover. So that's the route I plan on taking

smokenssz

iTrader: (24)

Hmmm, I'll check it out too. The only thing I'm really trying to do is get rid of the pos pcv split in the back of the intake that breaks and gets in the way.