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 $2900.

LS3 Heads flow over

CFM

LS7 Heads flow over

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.