Sinister Diesel Head Gaskets & ARP Head Stud Kit - Duramax 6.6L LB7/LLY 2001-05

In stock
Special Price $785.00 was $791.00

Engine Rebuild Kits Made to Last and Save You Money

ARP 2000 Head Studs:
Superior to Aircraft Quality; 220,000 PSI Heat Treatment
Centerless Ground as Near to Perfect as Possible
Post Heat-Treat Threadrolling for 20x Better Fatigue Strength
Sinister Black Diamond Gaskets:
Multi-layer Spring Steel Construction
Adaptive Fluoroelastomer (FKM) Coating
Sinister Lifetime Warranty
Kit Also Includes:
Exhaust Manifold to Head Gaskets
Exhaust Manifold to Up-pipe Gaskets
Up-pipe to Turbo Gaskets

2001 - 2004 Chevy Silverado HD 6.6L Duramax LB7 Diesel Trucks
2001 - 2004 GMC Sierra HD 6.6L Duramax LB7 Diesel Trucks
2004.5 - 2005 Chevy Silverado HD 6.6L Duramax LLY Diesel Trucks
2004.5 - 2005 GMC Sierra HD 6.6L Duramax LLY Diesel Trucks

Sinister Diesel Head Gaskets & ARP Stud Kit with Exhaust & Intake Gaskets

Sinister Diesel now offers LLY and LB7 Duramax Head Gasket and Stud Kits that include exhaust manifold gaskets. These kits include all the parts you need to replace the head gaskets on your 2001-2005 6.6L Duramax-powered Chevrolet Silverado HD or GMC Sierra HD while improving your engines durability by upgrading to legendary ARP Head Studs.

Kit Includes:
Grade C Black Diamond Head Gaskets
ARP 425 grade Head Studs
Intake runner sealant
Intake bridge o-rings
Exhaust manifold to head gaskets
Exhaust manifold to up-pipe gaskets
Up-Pipe to Turbo gaskets

ARP 2000 Head Studs

  • Industry Trusted Quality: ARP only uses premium grade 8740 alloy and a proprietary ARP2000 alloy that are rated far superior to "aircraft" quality alloy steels. Secondly, each stud is placed vertically into special racks and precisely heat-treated to 200,000 psi for the 8740 material and 220,000 psi for the ARP2000 material. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces into a basket and hope for the best.
  • Exacting Tolerances: Following heat-treat, each stud is centerless ground to make sure it is as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note lesser quality studs are not even centerless ground - the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned - something that won't happen with inferior quality head studs.
  • Unmatched Strength: ARP studs are thread rolled after heat-treat, which gives them about 2000% (that's twenty times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort.

Sinister Black Diamond Head Gaskets

Sinister Diesel has now perfected our multi-Layered Steel cylinder head gaskets. Featuring a durable black coating, with five stainless steel layers. Adaptive fluoroelastomer (FKM) coating flows to seal rougher surface finishes. These gaskets were designed to keep the cost down, and the performance up.

  • Designed for Extremes: These Sinister Black Diamond gaskets are designed to operate in the extreme heat and high cylinder pressures that your Diesel produces. Multi-layered stainless steel sandwich construction.
  • Adaptive Coating: These Factory Ford gaskets are coated with an adaptive fluoroelastomer (FKM) coating to ensure maximum seal of fluids. The FKM coating ensures a total seal between your block and cylinder head.
  • Sinister Lifetime Warranty: Every Sinister Diesel part is manufactured and tested right here at Sinister's California headquarters and comes with the legendary Sinister lifetime warranty.

More Information
Brand Sinister Diesel
Performance Type N/A
Diesel Engine Duramax 6.6L LLY 2004.5-2005, Duramax 6.6L LB7 2001-2004
OEM Make GMC, Chevrolet
OEM Model Sierra/Denali 2500, Sierra/Denali 3500, Sierra/Denali 3500 Chassis Cab, Silverado 2500HD, Silverado 3500HD, Silverado 3500HD Chassis Cab
Specific Year 2005, 2004, 2003, 2002, 2001

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Exclusive Freedom Diesel Performance Discounts

Save $45 On Any Order Over $699 w/ Coupon Code SAVE45QUICK


All of our packages include multiple related items at a special package discount. Our packages are designed to make your life easier, usually including all the parts you need to achieve a specific modification.

Price Matching Beating!

We want to make sure you get the best deal possible on your parts. We do our best to ensure we have the best prices in the industy, however, if you find an item cheaper, let us know and we will happily match or beat the price.

Discounts For Shops & Dealers

If you are an installation shop or dealer, give us a call or email for details on our dealer program. We are able to discount most items for shops.

Phone: 855-432-4733 9 AM - 6 PM EST Monday - Friday
Email: [email protected]

We Strive For Extremely Quick Shipping.

Whether you need a part to fix a downed truck, a performance part to get the edge on your competitors on race day, or just something to improve the look or functionality of your vehicle; freedom diesel performance you covered!

We understand the only reason you are purchasing a part, is because you really need it or really want it. We do everything in our power to ensure you get the purchased item as soon as possible.

*** Orders placed before 2 PM Est - Usually ship the same day. ***

Estimated Delivery Times:

- Tuners / Programmers by themselves - 2 to 3 Business Days

- Performance / Race Packages - 2 to 5 Business Days

- General Diesel Performance Parts - 2 to 5 Business Days 

- Lighting, Accessories, Etc - 2 to 7 Business Days 

(Alaska / Hawaii Add 3 Business Days)

Easy Return / Exchange Process

If for some reason, you order the incorrect product, or do not need the product prior to using it, we will accept it back as a return for refund or exchange up to 30 days from delivery. Must be in new, un-used condition with original packaging.

Due to credit card processing fees, shipping, and wear and tear to the packaging often occuring during shipping, returns may be subject to a 20% restocking fee.

If you need to setup a return or exchange, please contact us for an RMA#

Warranty Process

If the product you receive is damaged or defective, please contact us immediately for assistance. In most cases, we can send you a return label and fix the problem very quickly.

Although many of the products that we offer, are not for sale or use in California, is it still important to realize the below warning.

Prop 65 Warning:Cancer & Reproductive Harm

Unless otherwise specified on the product page description, every product on this website contains chemicals, which is known to the State of California to cause cancer. For more information, go to

Race Use products are for Closed Course Competition Use Only. Competition Use product should never be installed on a vehicle registered for highway use.