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Milling ls3 heads for lq4

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Old Jun 2, 2013 | 09:25 PM
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Default Milling ls3 heads for lq4
Has anyone milled ls3 heads on an lq4 to get 10:1 and run a .620-630" lift cam?
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Old Jun 3, 2013 | 08:15 AM
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Lift has little to do with PTV. What is the duration like on that cam and its LSA/ICL?
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Old Jun 3, 2013 | 09:52 AM
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Originally Posted by redtan
lift has little to do with ptv. What is the duration like on that cam and its lsa/icl?
bingo
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Old Jun 3, 2013 | 10:52 AM
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Considering an lsl lobe...looking for 23x duration and .63x lift on a 112

Maybe 231/239 617/ 624 112
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Old Jun 4, 2013 | 03:14 PM
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Old Jun 4, 2013 | 03:19 PM
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Measure PTV with unmilled heads and make a decision. Yes it is extra work, but that is the correct way.
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Old Jun 4, 2013 | 04:14 PM
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We have the ability to calculate P2V on custom cam orders. Having said that one thing LS3/L92 heads seem not to like very much is low compression. I would try my hardest to build a LS3/L92 NA motor to be at least 10.7-11.5.

If you need some help on the cam choice please let me know.


http://www.pcmofnc.com/index.php/per...stom-cam-specs

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Old Jun 4, 2013 | 07:35 PM
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I don't have the head cam setup yet, I'm wanting to know if it's possible or if i should do a243 head setup....
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Old Jun 5, 2013 | 09:16 AM
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I would do a decked 243 setup on that engine personally. Either way let us know if we can help you with the cam choice.
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Old Jun 5, 2013 | 11:06 AM
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You can't get away with a tight centerline with ls3's unless you're willing to fly cut pistons. My cam is 230's .600" lift on a 108lsa and had to cut .080"
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Old Jun 10, 2013 | 11:38 AM
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I may just run a ported fast 90 and mill the 317s .035, making about a 65cc chamber and use the tsp 233/239 cam
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