3.6L LLT cleaning - first step PCV Mod before valve cleaning - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

bcmike · 04-12-2021, 05:54 PM

I just bought an 2011 RS convertible with only 24,00 km on it but I paid a pretty penny for those low kms. First thing I did was put a catch can on it. I bought a new PVC valve to drill out but haven't done it yet. Now that I've seen these pics that's getting done ASAP!

Is there anything that can be done as preventative maintenance against that? I try to run premium fuel.

R0B · 01-17-2026, 03:45 PM

@alanrubin @greg p I'm curious, concerning the top hole, or outlet, on the PCV "valve". Within this thread Alan says to drill the top hole to either 7/64ths or 9/64ths. What determines which one you go with?? Why not split the difference and just go with 1/8th which is equivalent to 8/64ths?? Just trying to understand the logic behind the process. Thanks!!

1JEWLDSSRS · 01-17-2026, 07:00 PM

Quote:

Originally Posted by R0B

@alanrubin @greg p I'm curious, concerning the top hole, or outlet, on the PCV "valve". Within this thread Alan says to drill the top hole to either 7/64ths or 9/64ths. What determines which one you go with?? Why not split the difference and just go with 1/8th which is equivalent to 8/64ths?? Just trying to understand the logic behind the process. Thanks!!

As alanrubin stated, this(Pull the PVC out of the valve cover.
Drill the bottom holes to 5/64th.
Drill the top hole to 7 to 9/64th.)

He states 7/64th TO 9/64.. So your 8/64th would work just fine. Right in the middle..

1JEWLDSSRS · 01-17-2026, 07:08 PM

Here is a good video explaining it, a little slow, but detailed..

Greg P · 01-18-2026, 09:28 PM

Forgot all about this thread.
Just shy of 5 years later and I still haven't cleaned the valves. Back then I bought a Blue Driver. The mis-firing was solved with some GM fuel system treatment and after clearing the codes all has been good.

R0B · Yesterday, 07:11 PM

Quote:

Originally Posted by 1JEWLDSSRS

As alanrubin stated, this(Pull the PVC out of the valve cover.
Drill the bottom holes to 5/64th.
Drill the top hole to 7 to 9/64th.)

He states 7/64th TO 9/64.. So your 8/64th would work just fine. Right in the middle..

Aaahhh! Some how I missed that?? I'm going to split the difference and go with 1/8th (8/64th). Thanks!!

1JEWLDSSRS · Today, 06:29 PM

Quote:

Originally Posted by R0B

Aaahhh! Some how I missed that?? I'm going to split the difference and go with 1/8th (8/64th). Thanks!!

Yes sir, very welcome!

04-12-2021, 05:54 PM	#15
bcmike Drives: 2011 Camaro Convertible V6 Join Date: Mar 2021 Location: Vancouver BC Posts: 6	I just bought an 2011 RS convertible with only 24,00 km on it but I paid a pretty penny for those low kms. First thing I did was put a catch can on it. I bought a new PVC valve to drill out but haven't done it yet. Now that I've seen these pics that's getting done ASAP! Is there anything that can be done as preventative maintenance against that? I try to run premium fuel.

01-17-2026, 03:45 PM	#16
R0B Drives: 2010 SG coupe 2012 45th convertible Join Date: Sep 2024 Location: St Louis, MO Posts: 17	@alanrubin @greg p I'm curious, concerning the top hole, or outlet, on the PCV "valve". Within this thread Alan says to drill the top hole to either 7/64ths or 9/64ths. What determines which one you go with?? Why not split the difference and just go with 1/8th which is equivalent to 8/64ths?? Just trying to understand the logic behind the process. Thanks!!

01-18-2026, 09:28 PM	#19
Greg P Drives: 2011 Camaro 2LT/RS Red Jewel Tint Join Date: Mar 2021 Location: BC Canada Posts: 13	Forgot all about this thread. Just shy of 5 years later and I still haven't cleaned the valves. Back then I bought a Blue Driver. The mis-firing was solved with some GM fuel system treatment and after clearing the codes all has been good.