.040 head gasket on LS3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

zz430camaro · 02-24-2018, 04:26 PM

Anyone running a Cometic 0.040 head gasket on a stock lS3?

Rhino79 · 02-24-2018, 05:29 PM

We do a lot. Be careful on piston to valve clearance depending on cam. You will lose a little over .010 clearance.

sixty9fordkiller · 02-28-2018, 06:40 PM

Quote:

Originally Posted by zz430camaro

Anyone running a Cometic 0.040 head gasket on a stock lS3?

compression ratio!!!

sixty9fordkiller · 02-28-2018, 06:49 PM

you know what, Rick Crawford created a mean street/strip proven setup for the G8 guys that consists of stock LS3 heads ported and milled to 64cc on 6.0 blocks with a cometic 0.040 gasket with what they call a "little lunati" cam (223 intake duration) and a stock intake manifold with the rod mod like the one GPI does and those fellas are running low 11's/high 10s with a stock 3.27 or 3.45 out of a 5th Gen camaro with a very streetable heavy (but fast) NA car. Its good stuff!

zz430camaro · 02-28-2018, 07:08 PM

Quote:

Originally Posted by sixty9fordkiller

you know what, Rick Crawford created a mean street/strip proven setup for the G8 guys that consists of stock LS3 heads ported and milled to 64cc on 6.0 blocks with a cometic 0.040 gasket with what they call a "little lunati" cam (223 intake duration) and a stock intake manifold with the rod mod like the one GPI does and those fellas are running low 11's/high 10s with a stock 3.27 or 3.45 out of a 5th Gen camaro with a very streetable heavy (but fast) NA car. Its good stuff!

Yep, that is kid of what I am modeling my engine after. I am doing Street Smart ported heads from Land Speed Cylinder Head Development, GPI fully ported and rod mod intake (same as RCR intake) and a small 225/236 duration cam. Should be a great street set up but time will tell, hoping to button this thing up in the next month. Name: 20180228_110507.jpg
Views: 1647
Size: 159.3 KB

Name: 20180228_110507.jpg
Views: 1647
Size: 159.3 KB

Name: image2.jpeg
Views: 1544
Size: 62.6 KB

Name: image3.jpeg
Views: 1517
Size: 46.4 KB

Name: image1.jpeg
Views: 1537
Size: 87.0 KB

Punisher_ATX · 03-01-2018, 09:16 AM

How much was milled from the heads when they did the porting?

bhillakaiceberg · 03-01-2018, 09:41 AM

I just dropped a Cometic .040 Gasket w/ GPI Ported heads milled .050 on my buddy's LS3 GPI SS3 cammed 5th gen to build compression...

sixty9fordkiller · 03-01-2018, 09:52 AM

.050???? woooooooo! thats about a 12.4:1 SCR

Who needs pump gas anyways!

sixty9fordkiller · 03-01-2018, 09:56 AM

did you get their new 13 degree heads? or did you get their ported LS3 castings and flycut the pistons?

bhillakaiceberg · 03-01-2018, 10:22 AM

Quote:

Originally Posted by sixty9fordkiller

did you get their new 13 degree heads? or did you get their ported LS3 castings and flycut the pistons?

Just regular ole Ported castings and flycutted...

zz430camaro · 03-01-2018, 02:13 PM

Quote:

Originally Posted by Punisher_ATX

How much was milled from the heads when they did the porting?

0.010 for clean-up, finished chamber is 68 cc

07-SRT · 03-01-2018, 05:04 PM

Quote:

Originally Posted by zz430camaro

0.010 for clean-up, finished chamber is 68 cc

Just for comparison on what I ended up with Landspeed heads

zz430camaro · 03-01-2018, 05:32 PM

Cool, I ended up getting a 0.045 gasket so I should be right around 11:1 compression wth 0.038 quench height.

zz430camaro · 03-01-2018, 05:38 PM

Quote:

Originally Posted by 07-SRT

Just for comparison on what I ended up with Landspeed heads

It was hard to resist getting the intake runners fully ported but everytime I saw dyno data from his heads it really worked and from your results I would say that holds true. Most of the flow increase happens right under the valve.

02-24-2018, 04:26 PM	#1
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	.040 head gasket on LS3 Anyone running a Cometic 0.040 head gasket on a stock lS3?

02-28-2018, 06:49 PM	#4
sixty9fordkiller Donkey Dick Cam Camaro Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009 Location: Los Angeles, CA Posts: 1,998	you know what, Rick Crawford created a mean street/strip proven setup for the G8 guys that consists of stock LS3 heads ported and milled to 64cc on 6.0 blocks with a cometic 0.040 gasket with what they call a "little lunati" cam (223 intake duration) and a stock intake manifold with the rod mod like the one GPI does and those fellas are running low 11's/high 10s with a stock 3.27 or 3.45 out of a 5th Gen camaro with a very streetable heavy (but fast) NA car. Its good stuff! __________________ Bone Stock

03-01-2018, 09:41 AM	#7
bhillakaiceberg Drives: 2011 2SS/RS & 2017 1SS Join Date: Apr 2011 Location: Maryland Posts: 1,960	I just dropped a Cometic .040 Gasket w/ GPI Ported heads milled .050 on my buddy's LS3 GPI SS3 cammed 5th gen to build compression... __________________ *2011 Chevrolet Camaro 2SS/RS L99* (1 of 782) 10.78 @125mph ALL MOTOR SBE Built/Tuned by Me 2017 Chevrolet Camaro 1SS Auto 9.29 @144.57mph ALL MOTOR SBE #TEAMGPI Gwatney Performance Innovation

03-01-2018, 09:52 AM	#8
sixty9fordkiller Donkey Dick Cam Camaro Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009 Location: Los Angeles, CA Posts: 1,998	.050???? woooooooo! thats about a 12.4:1 SCR Who needs pump gas anyways! __________________ Bone Stock

03-01-2018, 09:56 AM	#9
sixty9fordkiller Donkey Dick Cam Camaro Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009 Location: Los Angeles, CA Posts: 1,998	did you get their new 13 degree heads? or did you get their ported LS3 castings and flycut the pistons? __________________ Bone Stock

02-24-2018, 05:29 PM	#2
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	We do a lot. Be careful on piston to valve clearance depending on cam. You will lose a little over .010 clearance.

03-01-2018, 09:16 AM	#6
Punisher_ATX Drives: 2010 SS Join Date: Jun 2015 Location: Austin Posts: 439	How much was milled from the heads when they did the porting?

03-01-2018, 05:32 PM	#13
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	Cool, I ended up getting a 0.045 gasket so I should be right around 11:1 compression wth 0.038 quench height.