Heads & Accessories

Heads & Accessories

Maximize the power in your LS Swap - Heads are a huge part of your success. Let's get your flowing more today!

Stock head information:

241 & 853
Heads: 1997+LS1 5.7- liter passenger car
Material: Aluminum
Part Number: 12559853 (1997-98)
1255853 (1999-00)
12564241 (2001-03)

Combustion chamber Volume:66.67cc
Compression Ratio:10.1:1
Intake port Volume:200cc
Exhaust Port Volume:70cc
Intake valve Diameter:2.00-inches
Exhaust valve Diameter:1.55-inches

What you need to know

The standard issue LS1 heads is best all-around head for the street / strip engines . A thorough porting and milling job plus a valve upgrade on these will really wake up your engine.The heads have undergone only minor revisions since their introduction in 1997 , most notably a switch from perimeter to center valvcover bolt configuration for the 1999 model year. Each style has its own dedicated valvecovers and coilpacks mounting apparatus.

243
Heads: 2001+ LS6 5.7 liter passenger car
Material:Aluminum
Part Number: 12564243

Combustion chamber Volume:64.45cc
Compression Ratio:10.5:1
Intake port Volume:210cc
Exhaust Port Volume:75cc
Intake valve Diameter:2.00-inches
Exhaust valve Diameter:1.55-inches

What you need to know

The LS6 cylinder heads is essentially a tuned-up version of the LS1 head. At 65cc, the combustion chamber is slightly smaller and more efficient than the LS1. The more efficient design shortens burn times and ultimately means less ignition timing advance is required to produce the same power. And because less timing allows more efficient combustion, the Ls6 heads allow the engine to produce more torque. The exhaust port is a unique D-shape that improves flow. LS6 heads are the best choice only when all-out power is needed. Be prepared for a big price tag at the dealer or steep core charge from your head porter.

706 & 852 & 862
Head: 1999+ LR4 4.8-liter Truck
1999+ LM4 / LM7 5.3-liter Truck

Material:Aluminum
Part Number: 12559852, 12561706 ,12559862

Combustion chamber Volume:61.15cc
Compression Ratio:9.5:1
Intake port Volume:200cc
Exhaust Port Volume:70cc
Intake valve Diameter:1.89-inches
Exhaust valve Diameter:1.55-inches

What you need to know

These small combustion chamber truck heads offer no advantage over an LS1 head except the smaller combustion chamber. This along with milling of the deck surface will allow a slightly higher compression ratio to be achieved. Because of the smaller intake valve installed in these heads a valve upgrade is practically mandatory.

873
Head: 1999-2000 LQ4 6.0-liter Truck
Material: Cast Iron
Part Number: 12567873

Combustion chamber Volume:71.06cc
Compression Ratio:9.5:1
Intake port Volume:210cc
Exhaust Port Volume:75cc
Intake valve Diameter:2.00-inches
Exhaust valve Diameter:1.55-inches

What you need to know                                                                                                                                            

 The LQ4 heads are found on the low-performance version of the 6.0-liter truck engine. They offer a large combustion chamber that lowers compression ratio making them perfect for a forced induction application. Swapping on the LQ4 head drops the compression ratio of a typical LS1 engine to 9:5.1 Cast-iron casting are heavy!

317
Head: 2001+ LQ4 6.0-liter Truck
Material:Aluminum
Part Number: 12562317

Combustion chamber Volume:71.06cc
Compression Ratio:9.4:1
Intake port Volume:210cc
Exhaust Port Volume:75cc
Intake valve Diameter:2.00-inches
Exhaust valve Diameter:1.55-inches

What you need to know

The LQ4 head received aluminum heads starting in models year 2001. All other features are the same as previous years iron heads. This is the workhorse head for street / strip turbo and blower cars.

035
Head: 2002+ LQ9 6.0-liter Truck
Material:Aluminum
Part Number: 12572035

Combustion chamber Volume:71.06cc
Compression Ratio:10:1
Intake port Volume:210cc
Exhaust Port Volume:75cc
Intake valve Diameter:2.00-inches
Exhaust valve Diameter:1.55-inches

  • 1999-2018 6.0 LS Rotating Assembly

    SCAT

    MSRP: $2,999.99
    $2,699.99
    When making big power is in your future, look no further than a proper build kit like this one from SMM! This Scat Modern Muscle engine rotating assembly is equipped with high-quality Scat forged 4340 crankshafts and I-beam connecting rods with 7/16 in...
    MSRP: $2,999.99
    $2,699.99
  • 215 Cylinder Heads

    215 Cylinder Heads

    Trick Flow Specialties

    $1,289.99
    Trick Flow GenX® 215 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance of LSx engines. Trick Flow engineers altered the valve angles from 15° to 13.5° to decrease valve shrouding, increase mid-lift...
    $1,289.99
  • These ARP High Performance series connecting rod bolts are made from seamless and defect-free 8740 chromoly steel. All ARP rod bolts are heat-treated before grinding and thread rolling and have a large underhead radius for greater strength. Guaranteed to pass magnetic inspection testing, these bolts are nearly five times stronger than OEM bolts. They're used in applications ranging from stock replacement to Circle Track, marine, and drag racing engines.

Connecting Rod Manufacturer:Stock
Cap Retention Style:Cap screw
Rod Bolt Head Style:E
Rod Bolt Nut Style:12-point
Fastener Yield Strength (psi):200,000 psi
Connecting Rod Bolt Material:8740 chromoly steel
Nuts Included:No
Sold as a set of 16

    ARP Connecting Rod Bolt Kit

    ARP

    MSRP: $159.99
    $99.99
    These ARP High Performance series connecting rod bolts are made from seamless and defect-free 8740 chromoly steel. All ARP rod bolts are heat-treated before grinding and thread rolling and have a large underhead radius for greater strength. Guaranteed...
    MSRP: $159.99
    $99.99
  • ARP Product Image
These ARP High Performance series connecting rod bolts are made from seamless and defect-free 8740 chromoly steel. All ARP rod bolts are heat-treated before grinding and thread rolling and have a large underhead radius for greater strength. Guaranteed to pass magnetic inspection testing, these bolts are nearly five times stronger than OEM bolts. They're used in applications ranging from stock replacement to Circle Track, marine, and drag racing engines.

Connecting Rod Manufacturer:Stock
Cap Retention Style:Cap screw
Rod Bolt Head Style:E
Fastener Yield Strength (psi):200,000 psi
Connecting Rod Bolt Material:8740 chromoly steel
Nuts Included:No
Sold as a pair.
Notes:Cracked cap design.

    ARP Connecting Rod Bolts (Pair)

    ARP

    MSRP: $17.99
    $12.99
    These ARP High Performance series connecting rod bolts are made from seamless and defect-free 8740 chromoly steel. All ARP rod bolts are heat-treated before grinding and thread rolling and have a large underhead radius for greater strength...
    MSRP: $17.99
    $12.99
  • These ARP High Performance series head bolt kits are tough! They are rated at 170,000 psi--15 percent stronger than Grade 8 fasteners. They come available with hex heads or reduced wrenching 12-point heads that eliminate the need for valvetrain removal when re-torquing cylinder heads.

Fastener Style: Bolt
Undercut Stud: No
Head Style: Hex
Fastener Material: Chromoly
Fastener Finish: Black oxide
Washers Included: Yes
Cut to Fit:No

    ARP Head Studs for LS Swaps

    ARP

    MSRP: $239.99
    $199.99
    These ARP High Performance series head bolt kits are tough! They are rated at 170,000 psi--15 percent stronger than Grade 8 fasteners. They come available with hex heads or reduced wrenching 12-point heads that eliminate the need for valvetrain removal...
    MSRP: $239.99
    $199.99
  • Don't go all out on your LS Rebuild, just to take shortcuts on your block where it counts!! These ARP individual thread cleaning chasers are designed to clean those filthy, grimy, oily holes. They include the correct thread pitch and diameter for the most commonly used threads, and their 3-flute design offers added strength!
Don't go all out on your LS Rebuild, just to take shortcuts on your block where it counts!! These ARP individual thread cleaning chasers are designed to clean those filthy, grimy, oily holes. They include the correct thread pitch and diameter for the most commonly used threads, and their 3-flute design offers added strength!

    ARP Thread Chaser | M11 X 2.00

    ARP

    MSRP: $89.99
    $57.99
    Don't go all out on your LS Rebuild, just to take shortcuts on your block where it counts!! These ARP individual thread cleaning chasers are designed to clean those filthy, grimy, oily holes. They include the correct thread pitch and diameter for the...
    MSRP: $89.99
    $57.99
  • Brodix delivers the industry's most powerful and durable out-of-the-box LS head in it's class with their BR series. The ''BR 7'' comes standard with 72cc combustion chambers, bowls blended, and intake ports matched. The ''STS BR 7'' is a 100% CNC ported version that flows over 375cfm. The ''BR 7'' and the ''STS BR 7'' both utilize a 12° valve angle and 2.204'' / 1.614'' valve combination. The ''STS BR 7 273'' flows over 415cfm with a 72cc combustion chamber and 2.250'' / 1.614'' valves. The BR-series heads feature the ''6 head bolt per cylinder'' LSX block design but are standard LS block compatible and accepts standard LS7 valvetrain components. The 6-bolt LSX design easily and reliably handles increased cylinder pressures of turbocharged, supercharged or high compression applications. Every casting is poured from A-356 virgin aluminum and tested before Brodix utilizes their in-house processes such as CNC machining and heat treating to assure that you receive the best products for your hard-earned money. Solid, phosphorous bronze guides are used to reduce valve leakage and oil consumption. The ductile iron valve seats are installed for use with unleaded fuel. Sold in Pairs. Made in the USA! Brodix delivers the industry's most powerful and durable out-of-the-box LS head in it's class with their BR series. The ''BR 7'' comes standard with 72cc combustion chambers, bowls blended, and intake ports matched. The ''STS BR 7'' is a 100% CNC ported version that flows over 375cfm. The ''BR 7'' and the ''STS BR 7'' both utilize a 12° valve angle and 2.204'' / 1.614'' valve combination. The ''STS BR 7 273'' flows over 415cfm with a 72cc combustion chamber and 2.250'' / 1.614'' valves. The BR-series heads feature the ''6 head bolt per cylinder'' LSX block design but are standard LS block compatible and accepts standard LS7 valvetrain components. The 6-bolt LSX design easily and reliably handles increased cylinder pressures of turbocharged, supercharged or high compression applications. Every casting is poured from A-356 virgin aluminum and tested before Brodix utilizes their in-house processes such as CNC machining and heat treating to assure that you receive the best products for your hard-earned money. Solid, phosphorous bronze guides are used to reduce valve leakage and oil consumption. The ductile iron valve seats are installed for use with unleaded fuel. Sold in Pairs. Made in the USA!

    Brodix LS Compatible Cylinder Heads | BR 7

    Brodix

    MSRP: $1,699.99
    $1,399.99
    Brodix moves to the head of the class with BR7 LS compatible cylinder heads! Their BR Series heads offer more power out-of-the-box and take the ribbon for most durable LS-style cylinder head replacements. Brodix BR7 cylinder heads step forward with an...
    MSRP: $1,699.99
    $1,399.99
  • How important are ignition coils to the performance of your vehicle? Well, without them your spark plugs would never receive the high voltage needed to ignite the fuel. Securing them is also important—and that's the function of ICT Billet ignition coil brackets. Made from aerospace-grade aluminum, these brackets offer mounting points for a variety of coil styles. The brackets are available in different configurations and finishes; hardware is also included. Designed for use on Holley valve covers with Holley Smart Coils, or AMP EFI coils only.


How important are ignition coils to the performance of your vehicle? Well, without them your spark plugs would never receive the high voltage needed to ignite the fuel. Securing them is also important—and that's the function of ICT Billet ignition coil brackets. Made from aerospace-grade aluminum, these brackets offer mounting points for a variety of coil styles. The brackets are available in different configurations and finishes; hardware is also included. Choose the brackets designed for fitment on your make/model.

    Coil Relocation Kit | Billet Holley

    LSxEverything

    MSRP: $99.99
    $74.99
    How important are ignition coils to the performance of your vehicle? Well, without them your spark plugs would never receive the high voltage needed to ignite the fuel. Securing them is also important—and that's the function of ICT Billet ignition...
    MSRP: $99.99
    $74.99
  • Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree. Use in conjunction with Harmonic Balancer puller.

Heavy Duty Flywheel/Flexplate Holding Tools keep your engine from rotating while installing bolts. Made from 3/8 in. thick steel, this tool is designed to mount to the starter bolt flange, and combined with the puller, makes this a 10 minute job, vs. a couple of hours of cursing like a sailor and embarrassing your family members and friends!

 Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree. Use in conjunction with Harmonic Balancer puller.

Heavy Duty Flywheel/Flexplate Holding Tools keep your engine from rotating while installing bolts. Made from 3/8 in. thick steel, this tool is designed to mount to the starter bolt flange, and combined with the puller, makes this a 10 minute job, vs. a couple of hours of cursing like a sailor and embarrassing your family members and friends!

    Flexplate Holder

    LSxEverything

    MSRP: $89.99
    $54.99
    Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree. Use in conjunction with Harmonic Balancer puller. Heavy Duty Flywheel/Flexplate Holding Tools keep your engine from rotating while installing bolts. Made...
    MSRP: $89.99
    $54.99
  • Trick Flow GenX® 215 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance of 5.7L LS1 engines. Trick Flow engineers altered the valve angles from 15° to 13.5° to decrease valve shrouding, increase mid-lift airflow, and improve rocker arm-to-valve cover clearance. Top-of-the-line CNC Competition Ported runners have a premium high resolution surface finish for maximum flow and performance. The spark plugs were relocated in the CNC-profiled combustion chambers to enhance mid-lift airflow and increase the rigidity of the casting for extreme horsepower applications. Material was added at the rocker arm mounting points to increase high-rpm valvetrain stability.

Cylinder Head Style:Assembled
Cylinder Head Material:Aluminum
Intake Port Shape:Cathedral
Intake Valve Diameter (in):2.040 in.
Cylinder Head Finish:Natural
Combustion Chamber Volume (cc):64
CNC-Machined Combustion Chamber:Yes
Intake Runner Volume (cc):215cc
Exhaust Runner Volume (cc):80cc
CNC-Machined Intake Runner:Yes
CNC-Machined Exhaust Runner:Yes
Combustion Chamber Style:Heart
Intake Port Location:Standard
Exhaust Port Shape:Oval
Exhaust Port Location:Standard
Spark Plug Style:Angle
Intake Valves Included:Yes
Exhaust Valves Included:Yes
Exhaust Valve Diameter (in):1.575 in.
Valve Springs Included:Yes
Maximum Valve Lift (in):0.600 in.
Outside Diameter of Outer Spring (in):1.300 in.
Damper Spring Included:No
Number of Springs Per Valve:Dual
Retainers Included:Yes
Retainer Material:Chromoly steel
Locks Included:Yes
Lock Style:7 degree
Valve Stem Seals Included:Yes
Rocker Arm Studs Included:No
Rocker Arms Included:No
Rocker Arm Nuts Included:No
Guideplates Included:No
Valve Cover Mounting Style:Centerbolt
Accessory Bolt Holes Drilled:Yes
Intake Valve Angle:13.50
Exhaust Valve Angle:13.50
Valve Guides Included:Yes
Valve Guide Material:Bronze
Valve Seats Machined:Yes
Valve Seat Machine Style:3-angle
Valve Seat Material:Ductile iron
Steam Holes Drilled:No
Oiling Style:Through pushrod
Machined for O-Ring:No
Heat Crossover:No
Quantity:Sold individually.
Notes:Must be used with roller rocker arms. Recommended for use on engines with a minimum bore diameter of 3.900 in. Trick Flow GenX® 215 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance of 5.7L LS1 engines. Trick Flow engineers altered the valve angles from 15° to 13.5° to decrease valve shrouding, increase mid-lift airflow, and improve rocker arm-to-valve cover clearance. Top-of-the-line CNC Competition Ported runners have a premium high resolution surface finish for maximum flow and performance. The spark plugs were relocated in the CNC-profiled combustion chambers to enhance mid-lift airflow and increase the rigidity of the casting for extreme horsepower applications. Material was added at the rocker arm mounting points to increase high-rpm valvetrain stability.

Cylinder Head Style:Assembled
Cylinder Head Material:Aluminum
Intake Port Shape:Cathedral
Intake Valve Diameter (in):2.040 in.
Cylinder Head Finish:Natural
Combustion Chamber Volume (cc):64
CNC-Machined Combustion Chamber:Yes
Intake Runner Volume (cc):215cc
Exhaust Runner Volume (cc):80cc
CNC-Machined Intake Runner:Yes
CNC-Machined Exhaust Runner:Yes
Combustion Chamber Style:Heart
Intake Port Location:Standard
Exhaust Port Shape:Oval
Exhaust Port Location:Standard
Spark Plug Style:Angle
Intake Valves Included:Yes
Exhaust Valves Included:Yes
Exhaust Valve Diameter (in):1.575 in.
Valve Springs Included:Yes
Maximum Valve Lift (in):0.600 in.
Outside Diameter of Outer Spring (in):1.300 in.
Damper Spring Included:No
Number of Springs Per Valve:Dual
Retainers Included:Yes
Retainer Material:Chromoly steel
Locks Included:Yes
Lock Style:7 degree
Valve Stem Seals Included:Yes
Rocker Arm Studs Included:No
Rocker Arms Included:No
Rocker Arm Nuts Included:No
Guideplates Included:No
Valve Cover Mounting Style:Centerbolt
Accessory Bolt Holes Drilled:Yes
Intake Valve Angle:13.50
Exhaust Valve Angle:13.50
Valve Guides Included:Yes
Valve Guide Material:Bronze
Valve Seats Machined:Yes
Valve Seat Machine Style:3-angle
Valve Seat Material:Ductile iron
Steam Holes Drilled:No
Oiling Style:Through pushrod
Machined for O-Ring:No
Heat Crossover:No
Quantity:Sold individually.
Notes:Must be used with roller rocker arms. Recommended for use on engines with a minimum bore diameter of 3.900 in.

    GenX® 215 Cylinder Head

    Trick Flow Specialties

    MSRP: $1,500.00
    $1,250.00
    Trick Flow GenX® 215 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance of 5.7L LS1 engines. Trick Flow engineers altered the valve angles from 15° to 13.5° to decrease valve shrouding, increase...
    MSRP: $1,500.00
    $1,250.00
  • Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree.

Do it the easy way with our harmonic balancer removal kit. The HB kit includes a 3-jaw puller, four lengths of forcing rods, and a forcing screw with a 3/8 in. square drive for ratchet use, and a 3/4 in. hex for wrench or socket use. Heavy Duty Flywheel/Flexplate Holding Tools keep your engine from rotating while installing bolts. Made from 3/8 in. thick steel, this tool is designed to mount to the starter bolt flange, and combined with the puller, makes this a 10 minute job, vs. a couple of hours of cursing like a sailor and embarrassing your family members and friends! Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree.

Do it the easy way with our harmonic balancer removal kit. The HB kit includes a 3-jaw puller, four lengths of forcing rods, and a forcing screw with a 3/8 in. square drive for ratchet use, and a 3/4 in. hex for wrench or socket use. Heavy Duty Flywheel/Flexplate Holding Tools keep your engine from rotating while installing bolts. Made from 3/8 in. thick steel, this tool is designed to mount to the starter bolt flange, and combined with the puller, makes this a 10 minute job, vs. a couple of hours of cursing like a sailor and embarrassing your family members and friends!

    Harmonic Balancer Removal Kit

    LSxEverything

    MSRP: $169.99
    $114.99
    Stop trying to remove your Harmonic Balancer with a hammer, twine, and your neighbor's oak tree. Do it the easy way with our harmonic balancer removal kit. The HB kit includes a 3-jaw puller, four lengths of forcing rods, and a forcing screw with a...
    MSRP: $169.99
    $114.99
  • Cylinder Head Studs, Pro Series, Hex Head, Chevy, 4.8, 5.3, 5.7, 6.0L, Kit

    Head Stud Kit

    ARP

    $292.99
    ARP Pro Series cylinder head studs are cold-forged to ensure molecular integrity. They're heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all kits come complete with hardened parallel...
    $292.99
  • Billet Specialties LS Valve cover conversion kit gives modern performance classic style. The LS Valve Cover Conversion kit allows the use of perimeter style small block Chevrolet valve covers on an LS motor while hiding the coils underneath for a classic clean look. Recessed wire channels drop the wires where you need them for ease of installation.
Features:

 

Precision Machined from 6061-T6 Billet Aluminum
Works with the large LS3 coils (AC Delco D514A)
Hides the coils underneath the valve cover
Recessed wire channels for the plug wires and the coil harness
Retains the factory LS gasket for a leak free seal
Hidden Oil Fill Cap – one each side for ease of access.
Stainless Hardware included
Made in the USA
 
WILL NOT WORK ON 97-97 LS-1 CYLINDER HEADS CASTING # 806 OR 933. THESE HEADS HAVE A PERIMITER BOLT VALVE COVER. Billet Specialties LS Valve cover conversion kit gives modern performance classic style. The LS Valve Cover Conversion kit allows the use of perimeter style small block Chevrolet valve covers on an LS motor while hiding the coils underneath for a classic clean look. Recessed wire channels drop the wires where you need them for ease of installation.
Features:

 

Precision Machined from 6061-T6 Billet Aluminum
Works with the large LS3 coils (AC Delco D514A)
Hides the coils underneath the valve cover
Recessed wire channels for the plug wires and the coil harness
Retains the factory LS gasket for a leak free seal
Hidden Oil Fill Cap – one each side for ease of access.
Stainless Hardware included
Made in the USA
 
WILL NOT WORK ON 97-97 LS-1 CYLINDER HEADS CASTING # 806 OR 933. THESE HEADS HAVE A PERIMITER BOLT VALVE COVER.

    LSx Valve Cover Conversion

    Billet Specialties

    MSRP: $699.99
    $499.99
    Billet Specialties LS valve cover conversion kits add classic style to modern performance. These kits allow the use of perimeter-style small block Chevrolet valve covers on your LS motor, while hiding the coils underneath for a clean, classic look. The...
    MSRP: $699.99
    $499.99
  • Through innovative engineering, Proform has developed LS valve covers that will replace your generic looking stock LS valve covers and give them a totally personalized look. These new valve covers are taller than stock valve covers and can accommodate a wide variety of large valvetrain applications. They include unique mounting studs and oil-restricting baffles. Proform LS valve covers feature threaded mounting holes for integrated ignition coil brackets and are available in a variety of finishes to complement your specific engine compartment. Through innovative engineering, Proform has developed LS valve covers that will replace your generic looking stock LS valve covers and give them a totally personalized look. These new valve covers are taller than stock valve covers and can accommodate a wide variety of large valvetrain applications. They include unique mounting studs and oil-restricting baffles. Proform LS valve covers feature threaded mounting holes for integrated ignition coil brackets and are available in a variety of finishes to complement your specific engine compartment.

    Polished LS/LT Valve Covers

    ProForm

    MSRP: $399.99
    $299.99
    Through innovative engineering, Proform has developed LS valve covers that will replace your generic looking stock LS valve covers and give them a totally personalized look. These new valve covers are taller than stock valve covers and can accommodate a...
    MSRP: $399.99
    $299.99
  • ARP Pro series connecting rod bolts are precision CNC-machined to exacting specifications and designed for optimum reliability. They are heat-treated and threads are rolled to provide up to ten times more fatigue strength. This makes them far superior to standard OEM fasteners in terms of durability, and fully capable of handling the extra stress of high-combustion engines.

    Pro Series-Connecting Rod Bolts

    ARP

    $102.99
    ARP Pro series connecting rod bolts are precision CNC-machined to exacting specifications and designed for optimum reliability. They are heat-treated and threads are rolled to provide up to ten times more fatigue strength. This makes them far superior...
    $102.99
  • Because of frictional inconsistencies with oil, moly, and other lubricants it takes multiple cycles of torquing the bolt, loosening it, and tightening it again to obtain the required preload or stretch. Typically, when a fastener is first tightened, friction is at its highest point and the preload value or stretch is low. As the fastener is cycled numerous times the friction decreases and the preload increases. This phenomenon is called "preload scatter." With this ARP Ultra Torque assembly lubricant, a fastener need only be torqued once to get within 5 percent of ideal preload, and it remains consistent through all subsequent cycles (from race-prep machining through final assembly). Moreover, given the inconsistencies of ordinary lubes, it is quite possible for adjacent head bolts or studs to have vastly different preloads. This scatter causes bore distortion, hampers piston ring seal, and leads to poor head gasket sealing.

    Ultra Torque Assembly Lubricant

    ARP

    MSRP: $16.99
    $7.99
    Because of frictional inconsistencies with oil, moly, and other lubricants it takes multiple cycles of torquing the bolt, loosening it, and tightening it again to obtain the required preload or stretch. Typically, when a fastener is first tightened,...
    MSRP: $16.99
    $7.99