Drilling valve cover for catch can - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ToddB · 05-02-2014, 05:55 AM

Do you guys with forced induction drill out the drivers side valve cover for more air. Do you drill the nipple and also the small hole inside the valve cover? Or just the nipple on the outside. Also what size do you drill it? Thanks for any help.

ToddB · 05-02-2014, 09:47 AM

Anyone do this. I know I read it a while back somewhere but cant find it.

Unreal · 05-02-2014, 10:07 AM

Drill out the hole inside. Or run aftermarket covers, they are cheap, or drill a hole in the top away from nipple, weld an AN bung on. Many ways to do it. Holley valve covers are ~$155 so that is the route I went.

Elite Engineering · 05-02-2014, 10:31 AM

Quote:

Originally Posted by ToddB

Do you guys with forced induction drill out the drivers side valve cover for more air. Do you drill the nipple and also the small hole inside the valve cover? Or just the nipple on the outside. Also what size do you drill it? Thanks for any help.

The drivers side valve cover PCV barb should be drilled to 1/8" to 1/4" depending on who's system your installing. Make SURE to not drill all the way through the baffle below it as oil will splash into that hole from the rocker arms.

Also, let us know what system and how your planning on routing all so we can guide you there as well.

ToddB · 05-02-2014, 11:08 AM

I have the catch can routed correct. just doing a cam now and was going to drill the valve covers as long as I have them off now. I drilled the pvc barb. what I was wondering about is the small hole on the baffle. As to weather or not you drill that hole larger? Thanks guys.

Twin2010 · 05-02-2014, 02:41 PM

Yes, drill that hole in the driver side valve cover baffle to a bigger hole. Drilled mine out but cant remember which size. The bigger you can drill it the better

BullF-16 · 05-02-2014, 05:54 PM

I dont believe you drill out the baffle. Otherwise you will suck in oil, or oil will splash up. Just had this discussion with my shop and they had their fabricator weld in a patch on the baffle. My baffle did have a hole in it from drilling out the barb. The bit went too deep i guess. Just drill out the barb to 1/4" or larger. That should do it.

Maybe that's the reason every 2500 miles I had a good pint of oil in my RX Monster can.

grocerygetter · 05-02-2014, 06:56 PM

don't drill the baffle...just the inside of the nipple/fitting. or buy some nice holley covers...that's what I did. bam. solved.

Iam Broke · 05-02-2014, 08:09 PM

Holley covers are baffled well and have a larger breather opening. Cleans up the coil mounts by eliminating the brackets. Win/win.

ToddB · 05-03-2014, 08:23 AM

Thanks for the info guys. Putting the covers back on today

ToddB · 05-03-2014, 08:24 AM

Quote:

Originally Posted by BullF-16

I dont believe you drill out the baffle. Otherwise you will suck in oil, or oil will splash up. Just had this discussion with my shop and they had their fabricator weld in a patch on the baffle. My baffle did have a hole in it from drilling out the barb. The bit went too deep i guess. Just drill out the barb to 1/4" or larger. That should do it.

Maybe that's the reason every 2500 miles I had a good pint of oil in my RX Monster can.

My baffle does have a small hole in it from the factory. I will leave it as is.

grocerygetter · 05-04-2014, 06:12 AM

Quote:

Originally Posted by ToddB

My baffle does have a small hole in it from the factory. I will leave it as is.

Correct. The stock baffle has the hole it is supposed to have.

grocerygetter · 05-04-2014, 06:13 AM

Quote:

Originally Posted by ToddB

My baffle does have a small hole in it from the factory. I will leave it as is.

Correct. The stock baffle has the hole it is supposed to have.

JMT · 08-01-2015, 03:29 PM

This is a pic of what I have. 2013 v6, is it the one that needs to be drilled or is it the newer size as I bought late in the model year. If I need to drill how do I proceed from the pic? I know it should look straight and metal no 90 degree as in the pic but not sure how to proceed as this is my only car and if I need another part it won't be easy.

05-02-2014, 05:55 AM	#1
ToddB Drives: 2011 2SS Convertible Supercharged Join Date: Nov 2010 Location: WI Cert Welder Navy NSSN Posts: 1,157	Drilling valve cover for catch can Do you guys with forced induction drill out the drivers side valve cover for more air. Do you drill the nipple and also the small hole inside the valve cover? Or just the nipple on the outside. Also what size do you drill it? Thanks for any help.

05-02-2014, 10:07 AM	#3
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Drill out the hole inside. Or run aftermarket covers, they are cheap, or drill a hole in the top away from nipple, weld an AN bung on. Many ways to do it. Holley valve covers are ~$155 so that is the route I went. __________________ Nick Corvette Z06 -1200ish rwhp

05-02-2014, 05:54 PM	#7
BullF-16 USAF retired! Thank God! Drives: 2011 1SS, 1LT red,1LT/RS SGM 98Z28 Join Date: Jul 2011 Location: North Texas Posts: 2,799	I dont believe you drill out the baffle. Otherwise you will suck in oil, or oil will splash up. Just had this discussion with my shop and they had their fabricator weld in a patch on the baffle. My baffle did have a hole in it from drilling out the barb. The bit went too deep i guess. Just drill out the barb to 1/4" or larger. That should do it. Maybe that's the reason every 2500 miles I had a good pint of oil in my RX Monster can. __________________ HKE LSX427(Mast blk lbl 305 6bolt LS7heads, PatG231/246 blower cam, RWHP/TQ: 1281/1133 SNL Performance Custom Twin PT6766 BB turbos 4 to 25psi selectable on the Boost Leash controller, Squash dual 400LPH/ID2000s, ALKY 4 gal meth, Autometer AFR/Bst/oilpres/oiltemp/fuelpress gauges, Pedders Justice road crs pkg: All HD bushes, supercar 12kg coil overs, supercar ZL1 sways, camber plates all setup by JusticePete! :Gforce 9" 35spline S-Trac, 1500hp Outlaw axles, 3.5"alum DS, Monster Triple disc; 4xForgeline 19x10.5 4xBridgestone 305/30R19 RE-11, CTS-v calipers/rotors/Cobalt friction XR1/3 pads

05-02-2014, 06:56 PM	#8
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	don't drill the baffle...just the inside of the nipple/fitting. or buy some nice holley covers...that's what I did. bam. solved. __________________ -John S.

05-02-2014, 08:09 PM	#9
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Holley covers are baffled well and have a larger breather opening. Cleans up the coil mounts by eliminating the brackets. Win/win. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

05-02-2014, 09:47 AM	#2
ToddB Drives: 2011 2SS Convertible Supercharged Join Date: Nov 2010 Location: WI Cert Welder Navy NSSN Posts: 1,157	Anyone do this. I know I read it a while back somewhere but cant find it.

05-02-2014, 11:08 AM	#5
ToddB Drives: 2011 2SS Convertible Supercharged Join Date: Nov 2010 Location: WI Cert Welder Navy NSSN Posts: 1,157	I have the catch can routed correct. just doing a cam now and was going to drill the valve covers as long as I have them off now. I drilled the pvc barb. what I was wondering about is the small hole on the baffle. As to weather or not you drill that hole larger? Thanks guys.

05-02-2014, 02:41 PM	#6
Twin2010 Drives: 2010 twin turbo ss Join Date: Nov 2012 Location: Oklahoma City Posts: 306	Yes, drill that hole in the driver side valve cover baffle to a bigger hole. Drilled mine out but cant remember which size. The bigger you can drill it the better

05-03-2014, 08:23 AM	#10
ToddB Drives: 2011 2SS Convertible Supercharged Join Date: Nov 2010 Location: WI Cert Welder Navy NSSN Posts: 1,157	Thanks for the info guys. Putting the covers back on today

08-01-2015, 03:29 PM	#14
JMT Drives: 2013 1LT Join Date: Oct 2013 Location: Panama City Beach, FL Posts: 703 View My Garage	PVC drill This is a pic of what I have. 2013 v6, is it the one that needs to be drilled or is it the newer size as I bought late in the model year. If I need to drill how do I proceed from the pic? I know it should look straight and metal no 90 degree as in the pic but not sure how to proceed as this is my only car and if I need another part it won't be easy. Last edited by JMT; 10-15-2015 at 04:47 AM.