Part Number:

CNC-LS823-660HR

LS3 821 823 CNC Ported Aluminum Cylinder Heads Assembled .660 Lift (2 Heads)

CNC Ported LS3 821, 823 Cylinder Heads, Stainless 2.165 Intake Valve, 1.600 Exhaust valves, Locks, Retainers, .660 Lift Hydraulic Roller, 2 Heads, Fully Machined and Assembled

$2,199.95

Head Upgrades

Soften Chambers + $300.00

Customer Supplies Castings - $300.00

Qty

View Similar Items

⚠ PROP 65 WARNING

⚠ WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer. Please contact us to obtain a list of harmful chemicals. For more information, go to www.P65Warnings.ca.gov.

Skip to the end of the images gallery

Skip to the beginning of the images gallery

Image is a representation of this item. Actual item may vary.

Description

Ported LS3 821 / 823 aluminum cylinder heads, Bolt on 50-75+ Horsepower, Sold as a Pair

Included Components:

CNC Ported Intake ports (280cc)

CNC Ported Exhaust ports (93cc)

CNC Ported combustion chambers (72cc)

Multi-angle performance valve job

Resurfaced deck surface for MLS gaskets

Assembled and blue-printed to performance specs

CNC 2.165 Stainless 1pc 8mm Intake valves

CNC 1.600 Stainless 1pc 8mm exhaust valves

CNC chrome-moly valve spring retainers

CNC chrome-moly Valve Locks

CNC .660 lift springs

Seat Pressure: 165 pounds @ 1.780 Installed height

Open Pressure: 385 pounds .550 lift

Open Pressure: 422 pounds .630 Lift

Spring Rate: 408

Coil Bind: 1.060

Max lift: .660

Flow Numbers:

Intake Flow

.100 78 cfm

.200 163 cfm

.300 237 cfm

.400 290 cfm

.500 338 cfm

.600 369 cfm

.700 373 cfm

Exhaust Flow - no pipe

.100 48 cfm

.200 107 cfm

.300 148 cfm

.400 195 cfm

.500 210 cfm

.600 220 cfm

.700 226 cfm

Specifications

More Information
CNC Part Number	CNC-LS823-660HR
Price	$2,199.95
Sold As	Set
Manufacturer's Part Number	LS823-660HR
Brands	CNC-Motorsports
Part Types	Cylinder Head
Departments	Parts
Vehicle Make	Chevy LS
Combustion Chamber Size	72cc
Cylinder Head Material	Aluminum
Cylinder Head Style	Assembled
Exhaust Valve Size	1.600
Intake Valve Size	2.165
Custom Notices	⚠ PROP 65 WARNING