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Difference Between Lq4/lq9
mpope2
post Aug 26 2017, 10:18 AM
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Other than pulling heads and checking pistons; is there any way to differentiate a LQ4 from LQ9 6.0's?


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2002 Tahoe Z71: Medium Green Metallic, GT4 3:73s, Vette servo, GM White Keys, 285/70/17 BFG A/T KO2's, 6 on high, factory high pass crossover bypass, key fob un panic, Kenwood1665PS +1695PS 6.5" in the doors, 8" SSL SS8 out back, 04-06 tails, Weathertechs

2000 ECSB Sierra Z71: Pewter Metallic, GT5 4:10s, LQ9 swap, EGR delete, 40 series, MSD 8.5's, Vette servo, upgraded trans cooler, keys, 1.5" Zone BL, 315/75/16 BFG KO, 6 on high, key fob in panic, Kenwood 6.5"/ 4x6" in doors, 04-06 Silvy tails
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carguru
post Aug 26 2017, 05:19 PM
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Flat top pistons on lq9 vs dished on lq4. Boroscope through plug hole might be the only way without pulling heads. Vanity covers might be another giveaway--if it comes out of a Caddy.


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mpope2
post Aug 27 2017, 04:59 AM
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QUOTE (carguru @ Aug 26 2017, 07:19 PM) *
Flat top pistons on lq9 vs dished on lq4. Boroscope through plug hole might be the only way without pulling heads. Vanity covers might be another giveaway--if it comes out of a Caddy.


Thanks for the response. That's what I was afraid of, externally they are identical. I picked up a LQ9 from a trusted source this week for my upcoming swap, but I'm also looking for another LQ4/LQ9 for a friend.


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2002 Tahoe Z71: Medium Green Metallic, GT4 3:73s, Vette servo, GM White Keys, 285/70/17 BFG A/T KO2's, 6 on high, factory high pass crossover bypass, key fob un panic, Kenwood1665PS +1695PS 6.5" in the doors, 8" SSL SS8 out back, 04-06 tails, Weathertechs

2000 ECSB Sierra Z71: Pewter Metallic, GT5 4:10s, LQ9 swap, EGR delete, 40 series, MSD 8.5's, Vette servo, upgraded trans cooler, keys, 1.5" Zone BL, 315/75/16 BFG KO, 6 on high, key fob in panic, Kenwood 6.5"/ 4x6" in doors, 04-06 Silvy tails
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TexasVet
post Oct 7 2017, 02:54 PM
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317 stamped heads are 6.0 factory heads. Compression check; static compression for an LQ4 is 9.5-9.8:1 ; 10:1 for the LQ9, as advertised. There are other slight differences, but they are much more involved to check than just pulling the heads or bore scoping the cylinder.
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96superflow
post Oct 8 2017, 07:11 AM
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I don't know of any other way to know for sure other that what everyone else has already said.

I will say my brother just replaced his worn out 320k mile 5.3 (with a fresh trans) to a 6.0 lq9 in his 2003 Sierra, and even with the 5.3 tune the damn thing is a scalded dog. I would like to do one in my tahoe once I get it back to street-able use.

This post has been edited by 96superflow: Oct 8 2017, 07:11 AM


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2003 Suburban 2500 8.1l/4l85...BBP tune
2001 Tahoe LT 5.3/4l60e Vette servo & lengthen pin, Corsa Sport, Spectre CAI, Lift keys, GMT 900 Rear Springs and 1.5" spring spacers, Bilstein 5100s, 4 Hi, 6000K Low Beams, Depo Black Projectors, 265/75/16 Cooper ATPs, Hummer H3's, Weather Tech mats throughout, Ranch Hand Legend Front Bumper (Wrecked 9/15/2016...Rebuild possible...)
1996 S10 blazer SAS d30/8.8,4.10s, SUA Sky's Offroad Design Kit, Rancho 44044 springs,SOA Rearw/ Pro Comp AAL, RC 14" travel Shocks, 2"body lift, 33" tsl's
1997 Commuter Civic As stock as it can be...

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mpope2
post Oct 12 2017, 04:46 PM
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My install is complete. As stated above, with stock 5.3 ECM tune my LQ9 will run out lol. I'm currently building a tune with a local friend. I'll probably just look at changing to 6.0 timing tables and also deleting rear o2s and egr. Probably doing long tubes into true dual spintechs in the near future. I'm not doing any tuning trans wise. The original 60e has Appx 262k on her and has turned 295/315 tires most of its life.


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2002 Tahoe Z71: Medium Green Metallic, GT4 3:73s, Vette servo, GM White Keys, 285/70/17 BFG A/T KO2's, 6 on high, factory high pass crossover bypass, key fob un panic, Kenwood1665PS +1695PS 6.5" in the doors, 8" SSL SS8 out back, 04-06 tails, Weathertechs

2000 ECSB Sierra Z71: Pewter Metallic, GT5 4:10s, LQ9 swap, EGR delete, 40 series, MSD 8.5's, Vette servo, upgraded trans cooler, keys, 1.5" Zone BL, 315/75/16 BFG KO, 6 on high, key fob in panic, Kenwood 6.5"/ 4x6" in doors, 04-06 Silvy tails
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