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Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

milling l92 heads .030?

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Old Jun 15, 2008 | 01:08 PM
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Default milling l92 heads .030?
On a stock lq9 w/226/232 .604/.609 (with stock head gaskets)lwhat would be the hp/tq gain? Would there be any ptv issues? dynoed 383/346 a few weeks ago with stock l92 heads. What would the cr be?
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Old Jun 15, 2008 | 05:10 PM
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you will have a tight clearance on the intake valve

with a similar setup we had around .040" clearance
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Old Jun 15, 2008 | 07:11 PM
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would I gain enough power to justify having it done? What about porting the heads also?
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Old Jun 15, 2008 | 07:27 PM
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The reason is, that the motor has to come out due to a loss in compression in one of the cylinders. Its an lq4 now and want to replace the cast dished pistons with flat top forged pistons and mill the heads to lower the cc's . So what would be best ? flat tops with .030 milled l92's, flat tops without milling l92's or dished and milling l92's?
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Old Jun 15, 2008 | 09:31 PM
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I would do that and go with a flat top piston that has L92 reliefs, Mahle, Diamond, Wiseco etc. and mill the heads .030"
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Old Jun 15, 2008 | 09:41 PM
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ok, thanks !
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Old Jun 16, 2008 | 12:04 AM
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oh man that sig pic is brutal LMAO!
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Old Jun 16, 2008 | 06:39 AM
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Originally Posted by Fraser@SpeedInc
I would do that and go with a flat top piston that has L92 reliefs, Mahle, Diamond, Wiseco etc. and mill the heads .030"
2cc pistons should be all you need.
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Old Jun 21, 2008 | 10:11 PM
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I have my l92s milled .040 My cam is a 232/242 .595/.610 113lsa. I dont have an PTV clearance issues with my ls2. I run it hard every weekend with no problems.
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Old Jun 23, 2008 | 12:43 AM
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my pistons are diamond flat tops -1.8cc's stock heads around 11.4:1 c/r had amazing ptv clearence
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