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Cometic Gasket Cometic Gasket GM LS Gen-3/4 SB V8 .063in DST Cyl. Head Gasket - 4.150in Bore - 1/2in Studs
Cometic Gasket Cometic Gasket GM LS Gen-3/4 SB V8 .063in DST Cyl. Head Gasket - 4.150in Bore - 1/2in Studs
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Cometic Gasket GM LS Gen-3/4 SB V8 .063in DST Cyl. Head Gasket - 4.150in Bore - 1/2in Studs

CGSC15741-063
191070590529
Head Gaskets
Out of stock
$ 313.95 $ 282.56

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

Request For Information

Have questions about Cometic Gasket GM LS Gen-3/4 SB V8 .063in DST Cyl. Head Gasket - 4.150in Bore - 1/2in Studs? Fill out the form below and we'll get back to you by the next business day.
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