BR 7™ LS7 Compatible Series Cylinder Heads/12°

 BR 7™
• LS Compatible
• 262 cc Rectangular Intake Port Flows Over 360 cfm
• Exhaust Port Flows 221 cfm
• 71 cc CNC Ported Combustion Chambers
• 2.204 / 1.614 Valve Sizes
• Most Powerful Out-of-the-Box Head in its Class
• 4.125 Minimum Bore

 

STS BR 7
• LS Compatible
• 264 cc Rectangular Intake Port Flows Over 375 cfm
• Exhaust Port Flows 240 cfm
• 71 cc Combustion Chambers
• 2.204 / 1.614 Valve Sizes
• 100% CNC Ported
• 4.125 Minimum Bore

 

STS BR 7 273
• Flows Over 415 cfm
• 2.250 / 1.614 Valve Sizes
• 50° Valve Job (Intake)
• 45° Valve Job (Exhaust)
• 273 cc Intake Port
• Uses Standard LS7 Components
• 12° Valve Angle

 

STS BR 7 BS 273
• Accepts up to 1.650 Springs
• Flows Over 415 cfm
• 2.250 / 1.614 Valve Sizes
• 12° Valve Angle
• Uses Special Rockers
 
 
BP BR 7 285 BS™
• 12° Valve Angle
• 285 cc Intake Ports
• 2.250 / 1.580 Valve Sizes
• Flows Over 400 cfm
• 100% CNC Ported
• New High Flowing Exhaust for Turbo/Blower Use
• Large Valve Spring Pockets for Roller Cam
• Special Rockers Required
• A45 Copper Exhaust Valve Seats

 

BR 7-3
• 12° LS7 Compatible Valve Angle
• 280 cc Intake Ports
• 2.204 / 1.614 Valve Sizes
• Flows Over 380 cfm
• 100% CNC Ported
• 66 cc Combustion Chambers
• Uses LS3 Intake and Exhaust Chambers

 

BRODIX delivers the industry’s most durable replacement for the LS style cylinder heads with the introduction of the BR series. The BR 7 is an out-of-the-box version that comes standard with 71 cc combustion chambers, bowls blended, and intake ports matched. The STS BR 7 is a 100% CNC ported version that flows over 375 cfm. The BR 7 and the STS BR 7 both utilize a 12° valve angle and 2.204 / 1.614 valve combination. The STS BR 7 273 flows over 415 cfm with a 72 cc combustion chamber and 2.250 / 1.614 valves. The BP BR 7 285 BS is 100% CNC ported and flows over 415 cfm. This version of the BR 7 has a 285 cc intake port and 72 cc combustion chambers. 2.250 / 1.580 valves are installed to accommodate the new, bigger high flow exhaust ports for turbo or blowers. The BR 7 heads accept all standard LS components and share all of the legendary BRODIX features including: easily repairable A-356 virgin aluminum alloy and the strongest deck surface in the business. The STS BR 7 BS 273 has been added to the series for the racer who wants to use a 1.650 or smaller o.d. roller valve spring, but requires longer valves and special rockers.

Package Heads

Facts and Related Components

• PS CB:
Valve Bowls Blended

• PS MI:
Match Intake Ports

• PS Valve Job:
Competition Valve Job• Intake Valves:
2.204 x 5.200 o.a.l. x 8 mm Stem, Beadlock – BR 70204
(BR 7, STS BR 7)
2.250 x 5.200 o.a.l. x 8 mm Stem, Beadlock – BR 70225
(STS BR 7 273)
2.250 x 5.450 o.a.l. x 8 mm Stem, Beadlock – BR 72225
(STS BR 7 BS 273)

• Exhaust Valves:
1.614 x 5.230 o.a.l. x 8 mm Stem, Beadlock -BR 70614
(BR 7, STS BR 7, STS BR 7 273)
1.614 x 5.450 o.a.l. x 8 mm Stem, Beadlock – BR 72614
(STS BR 7 BS 273)
1.580 x 5.450 o.a.l. x 8 mm Stem, Beadlock
(BP BR 7 285 BS)

• Valve Springs:
1.350 Hydraulic Roller Spring – MA 221435,
180 lb Closed, 430 lb Open,
1.885 Installed Height,
.700 Maximum Lift
(BR 7, STS BR 7, STS BR 7 273)

1.550 Roller Spring – PAC 1325,
260 lb Closed, 770 lb Open,
2.155 Installed Height,
.800 Maximum Lift (STS BR 7 BS 273, BP BR 7 285 BS)

• Retainers:
1.290 7° Steel – MA 23610 (BR 7, STS BR 7, STS BR 7 273)
1.550 10° Titanium – MA 2398BR+ 50 (STS BR 7 BS 273, BP BR 7 285 BS)

• Valve Locks:
7° Machined Beadlock – MA 13098 (BR 7, STS BR 7, STS BR 7 273)
Super 7° Machined Beadlock – CC 632-16 (STS BR 7 BS 273, BP BR 7 285 BS)

• Rocker Studs:
Not Available

• Valve Seals:
8 mm – US VS31500 V

• Torque Heads:
11 mm Studs – 85 ft-lb With Oil
8 mm Studs – 26 ft-lb With Oil

• Torque Rocker Studs:
22 ft-lb

• Intake Gaskets:
GM 19172113, FEL-PRO 1208-3 (.060) –
(BR 7, STS BR 7)
GM 19172113 Trim to Fit, FEL-PRO 1208-3 Trim to Fit –
(STS BR 7 273, STS BR 7 BS 273, BP BR 7 285 BS)• Head Gaskets:
GM 12582179, FEL-PRO 1185-041 (4.175 Bore)• Exhaust Gaskets:
FEL-PRO 1440

• Head Studs:
ARP 234-4319 (6 pt)

• Accessory Bolt Holes Are Drilled

• Spark Plug Starting Points:
14mm 3/4 Reach Seals With Washer
NGK R5671A-7
for Pump Gas
NGK R5671A-8
for Racing Gas

• Spring Pockets:
1.350 Out of the Box, May Not be Cut Any Larger or Deeper
(BR 7, STS BR 7, STS BR 7, STS BR 7 273)
1.550 Out of the Box, May be Cut to 1.650 – No Larger of Deeper
(STS BR 7 BS 273, BP BR 7 285 BS)

• Valve Angle:
12°

• Flat Milling:
.0060 in PER cc

•Dowel Shift:
Not Available

• Pushrod Slots:
Standard (BR 7, STS BR 7, STS BR 7 273)
Special (STS BR 7 BS 273, BP BR 7 285 BS)

• Pistons:
Standard

• Rocker Arms:
Standard or Crower 74107 With Machining
(BR 7, STS BR 7, STS BR 7 273),
CROWER 74164F (STS BR 7 BS 273, BP BR 7 285 BS)

• Lifters:
Standard

• Pushrods:
Measure For Proper Length

• Valve Centerline:
Standard

• Intake Manifold:
Standard

Flow Chart cfm @ 28″ H20

Part Number Valve Size
0.200
0.300
0.400
0.500
0.600
0.650
7.000
8.000
9.000
BR 7 2.204 Intake 150 144 294 334 360 364      
1.614 Exhaust 113 158 188 208 216 221      
STS BR 7
(CNC Ported)
2.204 Intake 159 240 303 343 369 376 364    
1.614 Exhaust 116 169 208 224 233 235 240    
STS BR 7 273
(CNC Ported)
2.250 Intake 50° 147 233 286 344 381 409 416    
1.614 Exhaust 45° 116 169 208 224 233 235 240    
STS BR 7 BS 273
(CNC Ported)
2.250 Intake 50° 147 233 286 344 381 409 416    
1.614 Exhaust 45° 116 169 208 224 233 235 240    
BP BR 7 285 BS
(CNC Ported)
2.250 Intake 50° 161 236 298 351 389   402 407 418
1.580 Exhaust 55° 87 140 185 222 240   250 256 257
 

Basic Easy Order Numbers and More

Part# Easy
Order #
Port
Vol.
Cham.
Vol.
Int/Ext
Valve
Spring Seat
Pressure
Spring
Diam.
Ret.
ST/TI
Per
BR 7 Bare 1170000 262 71         2
BR 7 Pkg 1171000 262 71 2.204 / 1.614 180 1.350 ST 2
STS BR 7 Bare 1178000 264 71         2
STS BR 7 273 Bare
1178001 273 72         2
STS BR 7 BS 273 Bare
1178002 273 72         2
STS BR 7 Pkg
1178100 264 71 2.204 / 1.614 180 1.350 ST 2
STS BR 7 273 Pkg 1178101 273 72 2.250 / 1.614 180 1.350 ST 2
STS BR 7 BS 273 Pkg 1178102 273 72 2.250 / 1.614 260 1.550 TI 2
BP BR 7 285 BS Bare
1178004 285 72         2
BP BR 7 285 BS Pkg
1178103 285 72 2.250 / 1.580 260 1.550 TI 2
BP BR 7-3 Bare
1178003 280 66         2
BP BR 7-3 Pkg 1178104 280 66 2.204 / 1.614 180 1.350 ST 2