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G5X3 Piston - Valve Clearance?

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Old 12-28-2003 | 04:12 AM
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Default G5X3 Piston - Valve Clearance?

Lou, Louis, or other - what LS6 head combos are safe to run with this cam without cutting pistons? A friend is looking into buying the cam and is considering Patriot or TEA LS6 heads with bigger valves. What vlave sizes and how much milling are safe?

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Old 12-28-2003 | 04:27 AM
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I know a guy wanting to know the same question...

Last edited by Damian; 12-28-2003 at 04:33 AM.
Old 12-28-2003 | 09:52 AM
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I, too, would also like to know.
Old 12-28-2003 | 11:43 AM
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If you get the G5X-3 on a 114 LSA, it will fit with the patriot or TEA heads with 2.02 valves as long as they are NOT milled any. Your clearence will be about .205 thousandths. LG reccomends .220", but you can get by with .205". If you order the cam on a 112, flycutting is neccisary in every application unless you are using stock heads.
Old 12-28-2003 | 04:31 PM
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Thanks Beast Any word from LG on this?
Old 12-28-2003 | 05:29 PM
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LG commented on this a week ago when i asked....and as far as stock heads go..no problem...but with a fair amount of milling on any other heads...you have to cut pistons
Old 12-28-2003 | 06:41 PM
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Originally Posted by Reckless
Thanks Beast Any word from LG on this?
These are numbers I got from LG, and the X3/2.02/114 clearence is from first hand expierience.

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Old 12-28-2003 | 10:09 PM
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So with my stock LS6 heads i DEFINITELY would not have to flycut the pistons with the g5x3 for sure on either a 112 or 114, lsa, correct?
Old 12-28-2003 | 10:34 PM
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Originally Posted by MTI 427 C5 Roadster
So with my stock LS6 heads i DEFINITELY would not have to flycut the pistons with the g5x3 for sure on either a 112 or 114, lsa, correct?
You haven't ordered that thing yet? Pull that credit card out and get going! Wake that yellow BEAST up! Andy
Old 12-28-2003 | 10:39 PM
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FYI - I talked to Lou (I'm pretty sure it was him at LGM) about my setup when they were running the last special. I have MTI stage II w/ 2.055 valves and the heads are not milled. I was told fly cutting was necessary w/ the bigger valves.

I didn't discuss the 112 vs. 114 though.
Old 12-28-2003 | 10:48 PM
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Originally Posted by Bill00Formula
FYI - I talked to Lou (I'm pretty sure it was him at LGM) about my setup when they were running the last special. I have MTI stage II w/ 2.055 valves and the heads are not milled. I was told fly cutting was necessary w/ the bigger valves.

I didn't discuss the 112 vs. 114 though.
With 2.05's you will need to cut either way. I went through that all ready.
Old 12-29-2003 | 12:31 AM
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Yeah, that is more like a Stage 3 valve. But 2.02's should work OK without milling? Does that include a .002 or .003 clean up on the heads?
Old 12-29-2003 | 01:29 AM
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Originally Posted by MTI 427 C5 Roadster
So with my stock LS6 heads i DEFINITELY would not have to flycut the pistons with the g5x3 for sure on either a 112 or 114, lsa, correct?
The G5X-3 will fit with stock heads on a 114 LSA, but for a 112 would require them to be flycut. For this reason we recommend the G5X-3/114 for cam only installs. We figure if the heads are coming off you should go ahead and do a little head work too.
Old 05-15-2004 | 12:42 AM
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Originally Posted by Godspeed
The G5X-3 will fit with stock heads on a 114 LSA, but for a 112 would require them to be flycut. For this reason we recommend the G5X-3/114 for cam only installs. We figure if the heads are coming off you should go ahead and do a little head work too.
is the the same for the g5x2 ? 114 no need to fly cut but 112 lsa you would ? am i correct ?
Old 05-15-2004 | 01:15 AM
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What's the hp difference between the 112 and the 114 G5X-3?


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Old 05-15-2004 | 10:49 AM
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I've got the X3 on a 112 with Patriot Stage II LS6 heads. I did NOT flycut at all. I had .210 clearance on an untorqued head. So with torquing the heads I should have been around .200
Old 05-15-2004 | 12:17 PM
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What kink of hp would I be looking at with stock ls1 heads and all the bolt ons for a cam only install? What are the specs on this cam?
Old 05-15-2004 | 10:10 PM
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Just as a reference, I had heads that were milled .020 with 2.02 intake and 1.57 exhaust valves and Diamond pistons with -2 cc valve reliefs. With the G5X3 on a 112 lsa I had .160 on the exhaust side and around .230-.240 on the intake side. Keep in mind the intake valve relief is deaper than the exhaust. Without the valve reliefs, there would have no way I would be abler to run this cam.
Old 05-16-2004 | 03:07 PM
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Would I need to cut the pistons on a G5X2 on a 112 in a stock 02 LS1?
Old 05-16-2004 | 03:09 PM
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Originally Posted by Patrolman808
Would I need to cut the pistons on a G5X2 on a 112 in a stock 02 LS1?
No, it will be fine in a stock car.


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