Overview

XtremeCFM 6-bolt LS3 ported cylinder head was designed for maximum power on the LSX platform. Proven to over 1500WHP these heads can be configured with stainless steel or titanium intake valves for optimum performance. Each head comes standard with Inconel exhaust valves and are available with .660” or .685” lift springs configurations including titanium retainers.

Castings

6 Bolt Head
0.750″ Deck Structure
OEM/Factory Style Water Crossover Ports
7/16″ Stud Size For Main 10 Bolts
8mm Stud Size For Outer Tabs and Deck Studs
A357 T6 Aluminum
4.000” minimum bore size
273cc equivalent.
Aluminum casting performed overseas.

Our Process

5-Axis CNC Ported Intake Ports, Exhaust Ports, and Combustion Chambers
Hand Blended and Deburred
Final Wash
Quality Control at every stage of manufacturing

Options/Upgrades

Intake Valve Guides – Bronze
Exhaust Valve Guides – Bronze

Parts Included (standard)

Intake Valve Seats – Stainless Steel
Exhaust Valve Seats – Inconel

Flow Data

NOTE: Flow data recorded @ 28” depression, radius inlet, no pipe on exhaust

Lift	Intake	Exhaust
.100”	79.9	64.4
.150”	116.4	96.7
.200”	161.2	127.2
.250”	205.8	159.1
.300”	249.4	186.4
.350”	287.1	212.7
.400”	317.3	234.0
.450”	345.6	244.8
.500”	361.9	254.2
.550”	375.4	258.5
.600”	391.1	264.6
.650”	402.0	269.7
.700”	407.6	271.9
.750”	410.1	273.3

Metric	Value
Intake Port Volume	266.9cc
Exhaust Port Volume	108.3cc
Chamber Volume	68.2cc
Intake Valve Diameter	2.165”
Exhaust Valve Diameter	1.600”
Install Height	1.790”
Coil Bind Height	1.070”

CHE LSX/LTX Bronze Valve Guides

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