AK™ Series Cylinder Heads/13°

 

 


The AK series is the latest in sprint car technology. This head offers new features such as: a 13° valve angle, a relocated spark plug and down nozzle location, and a 80/135 valve spacing. The BP AK head is offered in three intake port sizes, 270 cc, 275 cc, and 285 cc. Special components required for these heads are injectors, sheet metal valve covers, and a shaft rocker system.

Package Heads

Facts and Related Components

• PS CB:
Valve Bowls Blended

• PS MI:
O-Ringed
(1.435 x 2.100)• PS Valve Job:
Competition Valve Job

• Intake Valves:
2.180 x 5.950 x 5/16

• Exhaust Valves:
1.600 x 5.950 x 5/16

• Valve Springs:
1.550 Roller Valve Spring – GA 1000,
240 lb Closed, 550 lb Open,
1.950 Installed Height,
.700 Maximum Lift

• Retainers:
1.550 10° Titanium – MA 2398BR

• Valve Locks:
5/16 – CC 610

• Valve Seals:
5/16 – CC 500

• Torque Heads:
70 ft-lb

• Torque Rocker Studs:
40-45 ft-lb• Intake Gaskets:
O-Ringed

• Head Gaskets:
350 – FEL-PRO 1003, COMETIC C5399
400 – FEL-PRO 1004, COMETIC C5403

• Exhaust Gaskets:
Spread Port – BRODIX MG 52464
(Trim to Fit), COMETIC C5424

• Head Studs:
Available Eclusively From BRODIX-
BRODIX BR HSAP (Aluminum Block)

• Accessory Bolt Holes Are Drilled

• Spark Plug Starting Points:
NGK R5671A-10
for Alcohol
NGK R5671A-9
for Racing Gas

• Spring Pockets:
1.550 Out of the Box, May be Cut to 1.625 –
No Larger or Deeper

• Valve Angle:
13°

• Angle Milling:
Not Available

• Flat Milling:
.0060 in PER cc

• Angle Machining:
Not Available

• Pushrods:
Special Length

• Rocker Arms:
Shaft System – T&D 2341,
JESEL KPS 20592

• Lifters:
.180 Offset

• Pistons:
Special 13°

• Intake Face Angle:

Valve Centerline:
80/135

Intake Manifold:
Fuel Injection

Flow Chart cfm @ 28″ H20

  Valve Size
0.200
0.300
0.400
0.500
0.600
0.650 0.700 0.800
BP AK 270
(CNC Ported)
2.180 Intake 154 236 298 333 361 373 376  
1.600 Exhaust 110 161 213 238 248 256 258  
BP AK 275
(CNC Ported)
2.180 Intake 157 237 305 348 374 380 387 388
1.600 Exhaust 110 161 213 238 248 256 258 261
BP AK 285
(CNC Ported)
2.180 Intake 157 239 298 339 369 378 382  
1.600 Exhaust 110 161 213 238 248 256 258  

Basic Easy Order Numbers

Part# Easy
Order #
Port
Vol.
Cham.
Vol.
Int/Ext
Valve
Spring Seat
Pressure
Spring
Diam.
Ret.
ST/TI
Per
AK 270 Bare
1310000             2
BP AK 270 Bare
1318000 270 52         2
BP AK 270 L Bare
1318001 270 52         2
BP AK 275
1318004 275 52         2
BP AK 275 L Bare
1318005 275 52         2
BP AK 285 Bare
1318002 285 52         2
BP AK 285 L Bare
1318003 285 52         2
BP AK 270 Special
1319000 Custom Order           2
BP AK 285 Special
1319001 Custom Order           2