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Holden V8 EFI 5.0L Alloy SuperX Cylinder Head (BARE) (PRICING PER HEAD)

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48.00 KGS
Calculated at checkout

Product Description




"600HP Out of the Box" "No Expensive CNC Porting Required"


 P/No. ABHA 5000-9SX (ASSEMBLED) (Machined Injector Notches) 

"Proudly Aussie Made for Aussie Cars!" 

NOTE: Pricing per single cylinder head, sold in pairs. 

 Using 50+ years knowledge and experience developing race-winning cylinder heads including GMH’s XU-1 and L34 programmes - we’ve produced the ULTIMATE injected Holden V8 alloy cylinder head... Introducing the SuperX

With inlet port cross ‘X’ section and volume 15% and 21% larger respectively than our legendary 5000-9... contributing to a raw 600HP+ potential direct from the box to your block, with further scope for specialist porting.

Yella Terra SuperX cylinder heads are striclty designed for peak horsepower and torque applications on heavily modified carburettor and EFI Holden V8 253, 308, 304, 355 and 383 combinations.

Proudly designed and manufactured in Australia.



  ABHA 5000-9 SuperX
Chamber finish Cast CNC
Inlet port vol. 168cc (wo/ notches) 204cc
Inlet valve dia. 2.020" 2.080"
Inlet port height 52.00mm 56.00mm
Inlet port width 31.00mm 33.00mm
Exhaust valve dia. 1.600" 1.600"
Exhaust port height 35.50mm 38.50mm
Exhaust port width 35.00mm 37.00mm
HP out-of-box 520hp 610hp


CFM @28" H20

  Valve dia. .100" .200" .300" .400" .500" .600" .700" .800"
Factory 1.940" 58.0 124.0 165.6 190.0 205.3 220.0 NA NA 
Imported alloy 2.020" 68.0 137.0 195.0 243.0 260.0 263.0 267.0 NA
SuperX 2.080" 67.1 136.1 191.5 228.1 251.5 276.9 288.0 301.8


SuperX Tech Spec

Material AS 601, 356-T6 heat treated aluminium
Minimum hardness 88hb
Weight 12.7kg (assembled)
Combustion chamber vol. 57cc (assembled)
Inlet port vol. 204cc (assembled)
Inlet port dimensions 56.0mm high 33.0mm wide
Exhaust port dimensions 38.5mm high 37.0mm wide
Inlet valve size 2.080" min
Inlet insert size 2.200" X .375"
Exhaust valve size 1.600" min
Exhaust insert size 1.750" X .375"
Spark plugs Thread 14x19mm (3/4") reach 5/8" hex tapered or flat seat
Spring pockets 1.50" dia min - material thickness: .420"
Installed height 1.760" w/ standard length valves
Valve angle 5.1°
Inlet valve position Standard
Inlet port position Standard
Exhaust valve position Moved 2.0mm away from inlet
Exhaust port position Moved 2.0mm toward inlet
Rockers YT 6313 Platinum

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