< Heads
LS3 6-bolt factory rocker
NEW for 2020!
Aussie manufactured LS3 6-bolt cylinder heads feature updated port options. These ports are already proven beyond 800hp N/A and have run 7.2 @ 190+mph in a 275 radial street driven Holden.
Complete heads starting from $AUD 4900.

Our LS heads are available with all these standard features and options:
- ALL new design
- Fits OE style rockers
- Multiple port configurations
- 250cc & 277cc intake runners
- Made in Melbourne Australia
- All heads are fully CNC ported and feature CNC valve seats
- CHE valve guides and seats
- 2.20″ intake valves
- 1.60″ exhaust valves

flow charts
Our LS 6-bolt ports are designed and developed by Darin Morgan at Reher-Morrison Racing Engines.
HRD LS3 CNC ported
2.8″ min cross section | 2.160″ intake valve | 1.60″ exhaust valve
LIFT | .200 | .300 | .400 | .500 | .600 | .700 | .800 | .900 |
---|---|---|---|---|---|---|---|---|
INLET cfm | 147 | 215 | 277 | 329 | 360 | 370 | 376 | 381 |
EXHAUST cfm | 108 | 144 | 171 | 200 | 235 | 242 | 248 | 251 |
HRD LS7 small bore 4in (suit LS3 block) CNC ported
2.80″ min cross secion | 2.150″ intake valve | 1.60″ exhaust valve
LIFT | .200 | .300 | .400 | .500 | .600 | .700 | .800 | .900 |
---|---|---|---|---|---|---|---|---|
INLET cfm | 151 | 228 | 286 | 337 | 343 | 353 | 367 | 370 |
EXHAUST cfm | 95 | 135 | 170 | 208 | 227 | 237 | 244 | 244 |
HRD LS7 CNC ported
3.20″ min cross secion | 2.20″ intake valve | 1.60″ exhaust valve
LIFT | .200 | .300 | .400 | .500 | .600 | .700 | .800 | .900 |
---|---|---|---|---|---|---|---|---|
INLET cfm | 160 | 230 | 293 | 341 | 378 | 384 | 395 | 398 |
EXHAUST cfm | 100 | 142 | 170 | 220 | 232 | 240 | 252 | 252 |
HRD LS7 CNC ported
3.30″ min cross secion | 2.230″ intake valve | 1.580″ exhaust valve
LIFT | .200 | .300 | .400 | .500 | .600 | .700 | .800 | .900 |
---|---|---|---|---|---|---|---|---|
INLET cfm | 138 | 215 | 281 | 339 | 375 | 392 | 401 | 419 |
EXHAUST cfm | 107 | 149 | 204 | 226 | 235 | 241 | 245 | 248 |



Can’t see what you’re looking for?
No problem. We have more LS port designs, but cannot possibly list them all, so please don’t hesitate to call or contact us.