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Spark Plug Gap...


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#1 black00chev

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Posted 30 June 2008 - 11:09 AM

Just picked up some fresh ACDelco Iridium plugs for the silverado and just curious as to what you guys are gapping them to... On the box it says gap to manufacturer specs but just wondering if you guys are doing anything different with any advantages.
'00 5.3L Z71 1500... Jason's Garage N. VA's PREMIER motorcycle dealer LOUDOUN MOTORSPORTS
tunned by Black Bear Performance, SLP CAI, Flowmaster cat-back, removed rear lift blocks, black SS 20s and 275/55-20 Pirelli ATRs

Mods to come:
TO...BE...BLACKED...OUT...
LT headers 3" SI/SO dumped, rear end upgrades, trans upgrades, cam, upgrade stock heads... wanna hit mid/low 13s n/a.
FUTURE PROJECT: C-10, bagged, LSX block and maybe just a little turbo or s/c...
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#2 MS3DALE

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Posted 30 June 2008 - 11:14 AM

This might help you.....

Service Information 2000 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Document ID: 1903277
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#03-06-04-060A: Information on New Spark Plugs and Gapping - (Feb 12, 2007)


Subject: Information on New Spark Plugs and Gapping


Models: 2004 Buick Rainier

2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

2004 Cadillac CTS-V

1997-2004 Chevrolet Corvette

1998-2002 Chevrolet Camaro

1999-2004 Chevrolet Silverado

2000-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express, TrailBlazer

1999-2004 GMC Sierra

2000-2004 GMC Yukon, Yukon XL

2001-2004 GMC Yukon Denali, Yukon XL Denali

2002-2004 GMC Sierra Denali

2003-2004 GMC Envoy XL

1998-2002 Pontiac Firebird

2004 Pontiac GTO

2003-2004 HUMMER H2

with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)



Attention: Please disregard the Set Gap Per Vehicle Specification statement on the side of an ACDelco® Iridium Spark Plug Box. The statement will be removed from the boxes in the future.



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This bulletin is being revised to bring attention to the Set Gap Per Vehicle Specification on the ACDelco® Iridium Spark Plug Boxes. Please discard Corporate Bulletin Number 03-06-04-060 (Section 06 -- Engine/Propulsion System).


--------------------------------------------------------------------------------

• A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed.

• The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01 mm (0.040 in) when the spark plug is made.


Notice: The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© 2008 General Motors Corporation. All rights reserved.

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

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#3 black00chev

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Posted 30 June 2008 - 11:48 AM

Hey thanks Rich... So check that they are at .040 and if not don't use, easy enough.
'00 5.3L Z71 1500... Jason's Garage N. VA's PREMIER motorcycle dealer LOUDOUN MOTORSPORTS
tunned by Black Bear Performance, SLP CAI, Flowmaster cat-back, removed rear lift blocks, black SS 20s and 275/55-20 Pirelli ATRs

Mods to come:
TO...BE...BLACKED...OUT...
LT headers 3" SI/SO dumped, rear end upgrades, trans upgrades, cam, upgrade stock heads... wanna hit mid/low 13s n/a.
FUTURE PROJECT: C-10, bagged, LSX block and maybe just a little turbo or s/c...
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#4 black00chev

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Posted 30 June 2008 - 12:37 PM

Also forgot to ask if anyone else wants to chime in... What, if any, spec are you tightening plugs to? Is there a specified torque or just go hand snug then 1/8-1/4 turn?

thanks.
'00 5.3L Z71 1500... Jason's Garage N. VA's PREMIER motorcycle dealer LOUDOUN MOTORSPORTS
tunned by Black Bear Performance, SLP CAI, Flowmaster cat-back, removed rear lift blocks, black SS 20s and 275/55-20 Pirelli ATRs

Mods to come:
TO...BE...BLACKED...OUT...
LT headers 3" SI/SO dumped, rear end upgrades, trans upgrades, cam, upgrade stock heads... wanna hit mid/low 13s n/a.
FUTURE PROJECT: C-10, bagged, LSX block and maybe just a little turbo or s/c...
Posted Image

#5 merlin5577

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Posted 30 June 2008 - 01:05 PM

Also forgot to ask if anyone else wants to chime in... What, if any, spec are you tightening plugs to? Is there a specified torque or just go hand snug then 1/8-1/4 turn?

thanks.



I believe the spec is around 18 ft-lbs, but your owners manual will list all the specs.
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2003 Chevrolet Silverado LS K2500HD 4X4 6.6L w/Allison 1000
K&N Cold Air Intake, Painless Performance 4-High Beam Relay Kit
1997 GMC Suburban SLT K1500 4X4 5.7L w/4L60E
PaceSetter Air Intake, ACCEL Plugs, Wires, Cap, Rotor, and Coil,
Edelbrock IAS Shocks, Painless Performance 4-High Beam Relay Kit

#6 MS3DALE

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Posted 30 June 2008 - 01:15 PM

From the service manual...

"For new aluminum heads tighten the spark plugs to 20 N·m (15 lb ft)."

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#7 black00chev

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Posted 30 June 2008 - 03:45 PM

well unfortunatly i dont have a 1/4-3/8 adapter for my 1/4" torque wrench so i just ran them down till they bottomed out and took her out for a test drive and she purrs just fine.
'00 5.3L Z71 1500... Jason's Garage N. VA's PREMIER motorcycle dealer LOUDOUN MOTORSPORTS
tunned by Black Bear Performance, SLP CAI, Flowmaster cat-back, removed rear lift blocks, black SS 20s and 275/55-20 Pirelli ATRs

Mods to come:
TO...BE...BLACKED...OUT...
LT headers 3" SI/SO dumped, rear end upgrades, trans upgrades, cam, upgrade stock heads... wanna hit mid/low 13s n/a.
FUTURE PROJECT: C-10, bagged, LSX block and maybe just a little turbo or s/c...
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#8 merlin5577

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Posted 30 June 2008 - 03:54 PM

From the service manual...

"For new aluminum heads tighten the spark plugs to 20 N·m (15 lb ft)."



Dale you the man! Do you know what the specs are for my 97 Suburban?
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2003 Chevrolet Silverado LS K2500HD 4X4 6.6L w/Allison 1000
K&N Cold Air Intake, Painless Performance 4-High Beam Relay Kit
1997 GMC Suburban SLT K1500 4X4 5.7L w/4L60E
PaceSetter Air Intake, ACCEL Plugs, Wires, Cap, Rotor, and Coil,
Edelbrock IAS Shocks, Painless Performance 4-High Beam Relay Kit

#9 MS3DALE

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Posted 30 June 2008 - 04:17 PM

From the service manual...

"For new aluminum heads tighten the spark plugs to 20 N·m (15 lb ft)."



Dale you the man! Do you know what the specs are for my 97 Suburban?



Spark Plugs (New Cylinder Head)
30 Nm
22 Lb Ft
--

Spark Plugs (Used Cylinder Head)
20 Nm
14 Lb Ft

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'07 SILVERADO Z71 LT2 "VortecMAX" 6-Liter,"Super-Duty" Auto Trans,9 1/2" rear-end w/3.73 G80 Locker,XM,On-Star,BOSE speaker system,Stabilitrak,Block Heater,Sunroof,18" ARE "Cannon" Wheels w/LT275/65R18 Goodyear Wrangler AT/S tires.
Custom tune by Justin at Black Bear,CORSA "Sport" exhaust system,EXTANG "Full-Tilt" snapless tonneau cover,Rough Country 1.5" front leveling kit,Fabtech 1" rear lift blocks,EZ-Down tailgate damper.
GM accessories...Hood Deflector,Molded Mud-Flaps,Ventvisors,Catch-All Floor-Mats,Bedrail Protectors,BedRug Bedliner & Bedmat,and a GM Performance Parts cold-air intake.

2011 CAMARO 2SS/RS - LS3/M6 - Inferno Orange Met. - HURST short-throw - Roto-Fab CAI - Kook's LTs - CORSA exhaust - Black Bear tuned (playtoy!)
2012 CRUZE 1LT - Blue Topaz Met. - RS pkg.- Convenience pkg. (work car!)

My Garage


#10 merlin5577

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Posted 30 June 2008 - 04:25 PM

Thank you Dale.
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2003 Chevrolet Silverado LS K2500HD 4X4 6.6L w/Allison 1000
K&N Cold Air Intake, Painless Performance 4-High Beam Relay Kit
1997 GMC Suburban SLT K1500 4X4 5.7L w/4L60E
PaceSetter Air Intake, ACCEL Plugs, Wires, Cap, Rotor, and Coil,
Edelbrock IAS Shocks, Painless Performance 4-High Beam Relay Kit