Starting with the factory casting from the already wicked ZR1, the LME CNC porting program will make your beast breath easy. As part of your full build or bolt on kit, these will be prime choice to gain the extra power to keep you planted hard in the seat come track day.
There are multiple methods of obtaining a set of LME CNC ported heads perfectly sculpted for your hot rod:
Standard Core Exchange - We will swap out your usable cylinder heads with a freshly ported and prepared set once we receive them via your preferred shipping method or drop-off. Therefore, you will not be charged for the core exchange.
Expedited Core Exchange - We will ship you a set of CNC ported heads fresh out of the machine and set up to your cam specs once the order is placed. Once your usable cores have made their way to us, LME will refund the cost of the cores.
Current GM LS9 Cylinder Head core value is $1,200.00
**No matter what method you choose, once order is placed, LME will contact you to ensure the best option is used for you or your shop. We will cover any details and clarify any question or concerns you may have. We will also seek out all possible information of the build to better provide the best service and parts for your project. This expedited service allows you or your installation shop to have all the parts in hand to complete a CNC ported head install without the down time and hassle of waiting on ported heads to arrive.
**By specifying your cam lift LME will assemble your cylinder heads with the proper spring installed height. This will result in optimal spring pressures and coil bind distance for maximum performance. Please include rocker ratio to ensure accuracy. (example: .650" lift with 1.8 ratio intake and exhaust)
*All Cylinder Heads Are Priced As ASSEMBLED Pairs
**CORE CHARGE WILL BE REFUNDED WHEN USABLE CORES ARE RETURNED BY CUSTOMER
FLOW NUMBERS WITH 4.125" BORE @ 28" WATER
*Flowed with radius inlet intake/no pipe exhaust
Intake Volume (cc)
GM LS9 8mm
Exhaust Volume (cc)
Intake Port Config.
Chamber Volume (cc)
Head Bolts/ Cyl.
Valve Guide Material
Valve Angle (degrees)
LME Standard Head Porting Process
Clean carbon from intake exhaust and chambers (used cores)
Debur sharp edges
Valve guide clearance measured and adjusted for application
CNC ported intake exhaust and chambers
Competition valve job
Valve job hand blended into ports
Combustion chambers measured and adjusted for application
Meticulous final cleaning of cylinder head and components
Intake valves back cut with optimal angle for application
Heads assembled and spring pressure set up for specific cam lifts/application