02-24-2018, 04:26 PM | #1 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
Posts: 1,485
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.040 head gasket on LS3
Anyone running a Cometic 0.040 head gasket on a stock lS3?
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02-24-2018, 05:29 PM | #2 |
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We do a lot. Be careful on piston to valve clearance depending on cam. You will lose a little over .010 clearance.
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02-28-2018, 06:40 PM | #3 |
Donkey Dick Cam Camaro
Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009
Location: Los Angeles, CA
Posts: 1,998
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compression ratio!!!
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02-28-2018, 06:49 PM | #4 |
Donkey Dick Cam Camaro
Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009
Location: Los Angeles, CA
Posts: 1,998
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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!
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02-28-2018, 07:08 PM | #5 | |
Drives: 2015 1LE Join Date: Oct 2015
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Quote:
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03-01-2018, 09:16 AM | #6 |
Drives: 2010 SS Join Date: Jun 2015
Location: Austin
Posts: 439
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How much was milled from the heads when they did the porting?
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03-01-2018, 09:41 AM | #7 |
Drives: 2011 2SS/RS & 2017 1SS Join Date: Apr 2011
Location: Maryland
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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...
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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 |
Donkey Dick Cam Camaro
Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009
Location: Los Angeles, CA
Posts: 1,998
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.050???? woooooooo! thats about a 12.4:1 SCR
Who needs pump gas anyways!
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03-01-2018, 09:56 AM | #9 |
Donkey Dick Cam Camaro
Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009
Location: Los Angeles, CA
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did you get their new 13 degree heads? or did you get their ported LS3 castings and flycut the pistons?
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03-01-2018, 10:22 AM | #10 |
Drives: 2011 2SS/RS & 2017 1SS Join Date: Apr 2011
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Just regular ole Ported castings and flycutted...
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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, 02:13 PM | #11 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
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03-01-2018, 05:04 PM | #12 |
Drives: 2015 Camaro SS Join Date: Sep 2011
Location: Jacksonville, Fl
Posts: 713
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Just for comparison on what I ended up with Landspeed heads
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2015 Camaro 2SS Cam/Heads/FBO 498/447 SAE |
03-01-2018, 05:32 PM | #13 |
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Location: Cleveland, OH
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Cool, I ended up getting a 0.045 gasket so I should be right around 11:1 compression wth 0.038 quench height.
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03-01-2018, 05:38 PM | #14 |
Drives: 2015 1LE Join Date: Oct 2015
Location: Cleveland, OH
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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.
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