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AMS Evo CNC Ported Race Heads
The AMS EVO IV-IX CNC Cylinder Head is the best performing and most researched design on the market. After countless hours of testing AMS came up with a port design that offers more than just peak flow numbers. Flow bench numbers don't always tell the whole story. AMS went one step further and correlated flow numbers to actual dyno data. Many vendors claim their head flows 250, 260, or 270 cfm but what does that really mean?
Most vendors claim their peak flow at max lift. Their head may flow 270 CFM at .500 lift but what about flow at lower lifts? The flow at low, mid and high lift has to be balanced a certain way to achieve the most effective power curve. AMS has developed a CNC program that not only brings consistent performance and quality but also makes the most power of any head that they've ever tested including their old design!
Flow Number 
Intake
.050" 61 CFM
.100" 107 CFM
.150" 151 CFM
.200" 189 CFM
.250" 222 CFM
.300" 244 CFM
.350" 258 CFM
.400" 269 CFM
.450" 274 CFM
.500" 277 CFM
Exhaust
.050" 44 CFM
.100" 88 CFM
.150" 134 CFM
.200" 193 CFM
.250" 229 CFM
.300" 245 CFM
.350" 249 CFM
.400" 255 CFM
.450" 261 CFM
.500" 265 CFM
Features
- Best performing and most researched design on the market
- CNC ported for optimum flow, performance and consistency across the head
- +1mm Supertech valves increase flow and performance
- High heat tolerant Inconel exhaust valves add durability
- Dual springs and titanium retainers for maximum performance up to 10,000 rpm
- Suitable for even aggressive high lift camshafts
- Precisely hand finished runners, chambers and blending of bowl area
- Available on a core exchange or for outright purchase
- Professionally assembled by AMS engine technicians
- Core heads are stripped, cleaned and assembled with new bronze guides and hardware
Specifications
- CNC machine ported with precise hand finishing
- Supertech 1mm over Inconel exhaust valves
- Supertech 1mm over stainless steel intake valves
- Supertech dual springs with titanium retainers
- Manganese bronze valve guides
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| (96-05) Mitsubishi EVO AMS EVO IV-VIII CNC Cylinder head NO CORE / Outright purchase |
| $3,995.00 |  | EVO VIII CNC Cylinder head NO CORE | | (96-05) Mitsubishi EVO AMS EVO IV-VIII CNC Cylinder head With core being sent in |
| $2,595.00 | | EVO VIII CNC Cylinder head With Core | | (06-07) Mitsubishi EVO AMS EVO IX CNC Cylinder Head NO CORE / Outright purchase |
| $4,095.00 | | EVO IX CNC Cylinder head NO CORE | | (06-07) Mitsubishi EVO AMS EVO IX CNC Cylinder Head with core being sent in |
| $2,695.00 | | IX CNC Cylinder Head With core | |
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