GM L92/LS3 CNC Ported Cylinder Heads 2.0

September 25, 2020 by  
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SKU: f09d804d4ba1 Category:



Big Bore GM LS Engines Stage 2 Porting
Our stage 2 program takes our stage 1 port design to the next level and also adds a new redesigned fully cnc-machined combustion chamber. We take the already good factory heads and incorporate our
CNC port program and custom 5 angle valve job to make a very good factory head perform great. We also include our dual .650″ lift spring with titanium retainers for outstanding reliability and performance with most any cams and mill to chambers to fit customer’s application.

Basic Package includes-
Full CNC ported 287cc intake and 95cc exhaust ports
Custom 5 angle valve job
Hand finishing of Valve job into Porting
Flow test with included sheet
Standard 72cc CNC Chamber
Blueprint ground intake and exhaust valves with necessary backcuts
Deck surface finished with CBN cutter for ultimate surface finish
Blueprint assembly in which all spring heights and pressures are checked

Head will fit 4.00″ bore but will require 4.125″ gasket.

Optional spring or aftermarket valve packages available.

Lift Intake Exhaust
0.100 71 55
0.200 155 118
0.300 240 190
0.400 302 253
0.500 344 273
0.550 358 280
0.600 360 284
* Tests conducted at 28″ of water, radius plate int. 1.875″ x 4.0″ exh. pipe

Additional information

Weight 60 lbs


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