SuperX HEADS ARE HERE!
"600HP Out of the Box" "No Expensive CNC Porting Required"
VN STYLE EFI ALLOY CYLINDER HEADS
P/No. ABH 5000-9SX (Machined Injector Notches)
"Proudly Aussie Made for Aussie Cars!"
NOTE: Priced & 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.
Notes:
Bare Super X Heads do NOT have valve seats fitted. Insert notch is machined undersize to cater for different valve & insert sizes. We recommend purchasing the Bare heads & consulting with your Engine Builder / Head machinist before purchasing valve seats.
Compare
| 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 | 52.00 mm | 56.00 mm |
| INLET PORT WIDTH | 31.00 mm | 33.00 mm |
| EXHAUST VALVE DIA. | 1.600" | 1.600" |
| EXHAUST PORT HEIGHT | 35.50 mm | 38.50 mm |
| EXHAUST PORT WIDTH | 35.00 mm | 37.00 mm |
| HP OUT-OF-BOX | 520 hp | 610 hp |
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 |
| 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 | Seats Not installed / Valves not included |
| INLET INSERT SIZE | Seats Not installed / Valves not included |
| 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 |
