With the combined feature of having a rigid Brodix A-356 aluminum casting with LMEs own porting, the BR3 cylinder head is an excellent choice when looking to improve beyond the factory GM LS3, LSA, or LS9 head. Standard attributes include precision CHE manganese guides with hollow stem intake and stainless exhaust valves. Steadfastness has never been so feasible for your LS3 headed power plant.
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## 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 acuracy. (example:  .650" lift with 1.8 ratio intake and exhaust)
All Cylinder Heads Are Priced As ASSEMBLED PairsÂ
FLOW NUMBERS WITH 4.125" BORE @ 28" WATER
LIFT
.100"
.200"
.300"
.400"
.500"
.600"
.700"
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 Valve Size
Â
INTAKE
 80
 155
 233
 290
 332
 354
 374
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 2.165"
Â
EXHAUST
 63
 124
 178
 225
 254
 266
 273
Â
 1.600"
Â
*Flowed with radius inlet intake/no pipe exhaust
Intake Volume (cc)
285 ccÂ
Rocker Config.
GM LS3 8mm Pedestal or Crower Shaft Mnt.
Exhaust Volume (cc)
100 ccÂ
Intake Port Config.
LS3
Chamber Volume (cc)
68.5 cc
Head Bolts/ Cyl.
6
Valve Guide Material
Bronze CHE
Valve Angle (degrees)
15o
LME Standard Head Porting Process
Clean carbon from intake exhaust and chambers (used cores)
Through inspection
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
