Additional Images

12578449 - LS7 (Gen III) CNC Cylinder Head Assembly

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

Pricing: $1,783.71


Complete GM LS7 Cylinder Head Assembly

  • 356-T6 aluminum
  • Fully CNC'd ports & chambers
  • C5R / LS7 rectangle port design - Requires intake manifold part number 25534394 or 12568976
  • Assembled with 2.20" titanium intake and 1.61" sodium filled exhaust valves
  • 12 valve angle
  • Designed for big bore blocks: LS7, C5R, LSX or Warhawk
  • 270cc CNC'd intake ports
  • 85cc CNC'd exhaust ports
  • 70cc CNC's combustion chambers
  • All fasteners are metric
  • capable of over 600 HP
  • Bare head # 12575450 is also available

Head contains the following components:

12591644 intake valve

12578455 exhaust valve

12578457 valve spring

10166345 valve lock

12596508 valve spring retainer

12482063 intake stem seals

12482062 exhaust stem seals

12596509 intake lash cap

Flow Data:

Intake Flow71145222271315332348352
Exhaust Flow60120159192207214219221

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 Exhaust Manifold Gasket
GM Performance Intake Manifold Gasket Seal Kit

Application List


Shipping Information

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

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