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Heads milled .015 with G5X3

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Old Nov 2, 2004 | 12:30 PM
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Default Heads milled .015 with G5X3

I am looking at a set of 5.3 heads but i just found out that they are milled .015. I was wondering if the X3 will clear even with this small amount of milling.

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Old Nov 2, 2004 | 12:49 PM
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The X3 will not fit with un-milled heads. You need new pistons or a fly cut to run that cam 'safely'.

LG said to fly cut .060 with un-milled heads, so you would need .075 to clear!
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Old Nov 2, 2004 | 12:51 PM
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Are you saying that even unmilled 5.3 heads you would have to flycut?
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Old Nov 2, 2004 | 01:01 PM
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I am running the X3 on my stock heads now with no problems.
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Old Nov 2, 2004 | 01:11 PM
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Just sharing what LG said... And yes, I was told to fly cut .060 with un-milled 5.3 heads.
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Old Nov 2, 2004 | 01:22 PM
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Originally Posted by jermstyle
Just sharing what LG said... And yes, I was told to fly cut .060 with un-milled 5.3 heads.
I have several people comment that the X3 would clear on a 114 but be close on a 112. That was with 853, 241 castings. Being that the 5.3 head has more compression it also has a lower overal deck thickness.
Gurus?

Brandon
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Old Nov 2, 2004 | 01:23 PM
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Originally Posted by jermstyle
Just sharing what LG said... And yes, I was told to fly cut .060 with un-milled 5.3 heads.
you need to fly cut on the 112, not the 114.
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Old Nov 2, 2004 | 02:08 PM
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Mines on a 114 LSA
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Old Nov 2, 2004 | 03:16 PM
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I have several people comment that the X3 would clear on a 114 but be close on a 112.

Can you not read?

Brandon
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Old Nov 2, 2004 | 09:04 PM
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Originally Posted by xfactor_pitbulls
I have several people comment that the X3 would clear on a 114 but be close on a 112.

Can you not read?

Brandon
That still don't answer my original question, can you read?
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Old Nov 3, 2004 | 01:00 AM
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he also has 5.3 heads!! not 5.7s ... I have the exact setup, x3, TEA stg2 5.3 heads milled .015 and am currently trying to figure out how much to dish my custom forged pistons...
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Old Nov 3, 2004 | 06:38 AM
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I can't imagine how reducing the lsa by two degrees would cause a 60 thousanths reduction in piston to valve clearance. Maybe I am just missing something.
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Old Nov 3, 2004 | 07:05 AM
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I believe the 5.3's should have same clearance if unmilled, the problem come once you get into larger valves I believe. I think you would probably have to flycut, but no one will be able to give you a definate answer, youll just have to check and see if thats what you want to run. Whatever you do, dont just hope that it works cause someone said it would.
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Old Nov 3, 2004 | 02:04 PM
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What valve size?
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Old Nov 3, 2004 | 02:08 PM
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Louis will get you the info you need, Joe.

If I were you I'd get a custom set of 5.3 S2s from TEA. Trust me
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Old Nov 3, 2004 | 02:40 PM
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Originally Posted by JoeT/A
That still don't answer my original question, can you read?
Joe, I was referring to the guy before you that said you have to fly cut 112 instead of 114. I tried to do that math with equations on here, but couldnt get an answer I would be confident enough passing on, due to the fact it is so close.

Good luck

Brandon
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Old Nov 3, 2004 | 06:16 PM
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My 5.3's are milled 0.030, and it took a pretty deep flycut - 080 or more to clear my G5X3 on 112 lsa with 2.04 valves. The big problem is the larger valve size, especially on a 112 lsa. Stock size valves on a 114 lsa are supposed to clear, any other combo requires a flycut. I'd call Lou to be sure how much.
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Old Nov 3, 2004 | 08:01 PM
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under_construction,
What problems would cutting the pistions that much cause? The reason I ask is because I have the same heads cut .025. I have a FM13 114+4 going in and if the shop tells me they have to cut for it I think I am going to step up to a G5X3 112 and have them cut a little more.
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Old Nov 3, 2004 | 10:32 PM
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Originally Posted by CANNIBAL
Louis will get you the info you need, Joe.

If I were you I'd get a custom set of 5.3 S2s from TEA. Trust me
Yeah that's the route it looks like it will be. Looks like spring might be fune now.
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Old Nov 4, 2004 | 01:05 AM
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O yah, i have oversized valves too
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