19354243 - LSX-LS3 Cylinder Head

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Pricing: $1,064.96



Extending the performance range of the LSX platform are GM Performance Parts new, six-bolt LSX cylinder heads. Many are capable of flowing more than 400 cfm and their six-bolts-per cylinder clamping design gives them bomb-proof strength. Your horsepower-building potential is nearly unlimited with LSX ends. These aluminum masterpieces of performance feature port and chamber designs based on popular and performance-proven production-style heads, such as the L92 and LS7 heads. They are easily identified by the engraved LSX logo on the ends. All LSX heads are made of 356- T6 aluminum and feature a thick, 5/8" thick deck that allows plenty of room for builder-specified combinations.

Additional features include:

  • Uses 11mm (10) and 8mm (13) head bolts (not included)
  • Accommodates production valvetrain components (except for Drag Race and Circle Track heads)
  • Includes premium beehive-type valve springs (except for Drag Race and Circle Track heads)
  • Extra material cast in the port areas to accommodate professional porting
  • Valve guides for 8mm valve stems
  • Racing-specific LSX-DR (Drag Racing) and LSX-CT (Circle Track) heads feature raised runner designs and other unique features designed to maximize performance at the track.

LSX Street Heads

Four LSX street head configurations are offered: The LSX-LS7 head, the LSX-LS3 head, the LSX-LS9 head and the LSX-L92 Small Bore head. The LSX-L92 head features smaller combustion chambers that are compatible with smaller-bore LS1 and LS6 engines. The street heads accommodate valve springs with up to 1.55" diameter bases, but can be machined for larger springs.

19201805 LSX-LS3 Cylinder Head Features:

  • L92 style rectangle port design
  • Assembled with 2.165" hollow stem intake and1.59" solid stem exhaust valves
  • 15 valve angle
  • Requires a minimum 4.00" bore for valve clearance
  • 260cc "as-cast" intake ports, 80cc "as-cast" exhaust ports
  • 70cc "as-cast" combustion chambers

Related Install Parts:
New Coil on Cover Holley Valve Covers
GM Performance LS Head Bolt Package
GM Performance LS Head Gaskets
GM Performance Standard deck LSX Head bolt kit (needed in addition to 2-17800568 bolt kits
GM Performance Tall deck LSX Head bolt kit (needed in addition to 2-17800568 bolt kits
GM LS Valve Cover Bolts with Seal
GM LS Valve Cover Gasket Seal
GM Performance Intake Manifold Gasket Seal Kit
GM Performance Exhaust Manifold Gasket
GM Performance CNC LS3 Cylinder Heads
GM Performance LS offset rocker arm kit 1.7:1 ratio

Application List


Shipping Information

  • Item Requires Shipping
  • 25.0 lbs.
  • W8.5000” x H6.4000” x L21.2000”

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