12629063 - LS3 Cylinder Head Assembly

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

Pricing: $561.37


12629063 LS3 Cylinder Head Assembly Features:

Aluminum performance head

  • Fits any LS family engine with 4.00" bore or larger
  • 2.165" hollow stem intake, and 1.59" solid stem exhaust valves
  • .550" max valve lift
  • As-cast L92 style 260cc intake ports
  • D-shaped exhaust ports
  • As-cast combustion chambers

Head 12615879 is assembled with the following components:

  • 12569427 Intake Valves
  • 10166344 Valve Spring Retainers
  • 12582719 Exhaust Valves
  • 12482063 Intake Valve Stem Seals
  • 12625033 Valve Springs
  • 12482062 Exhaust Valve Stem Seals
  • 10166345 Valve Locks

Lift .200" .300" .400" .500" .600"
Intake Flow 151 208 256 294 316
Exhaust Flow 111 152 174 183 189

Related Install Parts:
New Coil on Cover Holley Valve Covers
GM Performance LS Head Bolt Package
GM Performance LS Head Gaskets
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

Application List


Shipping Information

  • Item Requires Shipping
  • 24.0 lbs.
  • W22.0000” x H7.0000” x L9.0000”

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

Trusted Specialists GM engine & parts specialists
Located in the USA Owned, operated, & employed
Need Assistance? Call us at 888-748-4655
Mon-Thu 8am-6pm EST
Fri 8am-5:30pm EST
Have a Question Email us and we'll get back to you within 24 hours
Pace B2B