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”
|
|
