HRD LS 6-bolt

Aussie manufactured Higgins LS-series cast alloy CNC ported heads

Formally known as CID, our Aussie manufactured HRD Higgins LS-series cast alloy CNC ported heads are available to suit LS7, L98/LS3 ports for street and race applications.

Starting at $3300.

LS3 Heads flow over
0
CFM
LS7 Heads flow over
0
CFM

Our LS heads are available with all these standard features and options:

  • 6 bolts per cylinder
  • Raised runners with extra material on the intake face, allow the use of factory intake manifolds
  • Multiple port configurations
  • Chamber volumes from 55cc to 70cc
  • Made in Melbourne Australia
  • All heads are fully CNC ported and feature CNC valve seats
  • CHE valve guides and seats
  • .750” thick Deck
  • Spring pads will accommodate up to 1.650” diameter
  • Machined to suit 7/16 rocker stud bolts – shaft mounted rockers.

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.