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SKU: C15741-063 | UPC: 191070590529
Cometic Gasket GM LS Gen-3/4 SB V8 .063in DST Cyl. Head Gasket - 4.150in Bore - 1/2in Studs 1997-2017
Cometic C15741-063 delivers a .063in thick Direct Seal Technology (DST) multi-layer steel cylinder head gasket engineered for GM LS Gen-3/4 small block V8 engines with 4.150in bores and 1/2in studs. This gasket seals precisely in high-compression, boosted, and high-RPM applications common in LS performance builds. It supports modified blocks like Dart or World Products while maintaining head-to-block integrity under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Design: Provides durable sealing against combustion gases and coolants in high-pressure environments up to 12:1 compression ratios and beyond.
- 4.150in Bore Diameter: Matches enlarged LS bores for stroked crankshafts and big-bore kits without overhang or compression issues.
- .063in Compressed Thickness: Allows flexibility for deck heights from 9.240in to 9.300in common in LS racing setups.
- 1/2in Head Stud Compatibility: Works with ARP 2000 or Pro Series studs for secure clamping forces over 100,000 lbs.
- Cathedral Port Configuration: Fits LS1/LS2/LS6/L92-style heads with precise fire ring placement for leak-free operation.
Product Notes
- Requires mirror-polished deck surfaces on block and heads for optimal sealing.
- Use MLS-specific head bolts or studs and torque in sequence to manufacturer specs.
- Sold individually. order two for complete engine set.
Installation Notes
- Professional installation recommended.
- Verify bore size and deck flatness within 0.002in before installation.
- Compatible with ARP 1/2in head studs. apply thin layer of oil to studs and use Cometic sealant on edges if needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1997-2004 | Chevrolet | Corvette | Base LS1/LS6 |
| 1998-2002 | Chevrolet | Camaro | Z28/SS LS1 |
| 1998-2002 | Pontiac | Firebird | Formula/WS6 LS1 |
| 2004-2006 | Pontiac | GTO | Base LS1/LS2 |
| 1999-2007 | Chevrolet | Silverado 1500 | LQ4/LQ9 |
| 2005-2007 | Chevrolet | Corvette | Base LS2 |
| 2007-2013 | Chevrolet | Corvette | Z06 LS7 |
| 1997-2017 | GM | LS-Series Swap | 4.150in Bore Builds |
Why Choose Cometic?
- Proven in NHRA and drag racing with millions of miles of reliability.
- Advanced MLS layers resist blowout in 1500+ hp LS engines.
- Laser-etched fire rings ensure concentricity within 0.001in tolerances.
Frequently Asked Questions
-
Q: Will this gasket fit rectangle port LS3 heads?
A: No, C15741-063 is for cathedral port Gen3/4 LS1/LS2/LS6/LS7 heads. use C1565 series for rectangle port. -
Q: What material is used and thickness after compression?
A: Multi-layer stainless steel with .051in-.055in compressed thickness depending on clamping load. -
Q: What warranty applies and installation torque specs?
A: Limited lifetime warranty against defects. torque ARP 1/2in studs to 70-75 ft-lbs in 3 steps with moly lube.
Shipping & Handling
- Method: USPS Priority or UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Protective cardboard sleeve 12in x 12in x 1in
- Weight: 0.60 lbs
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