After months of testing we’re ready to announce our CNC head program. We’ve tested 4 different variations of porting and valve jobs to get the best performing combination available.

Flow bench number don’t always tell the whole story. We went one step further and correlated flow numbers to actual dyno data. Many vendors claim their head flows 250, 260, or 270 cfm, what does that really mean?

What most vendors claim their peak flow at max lift. So a head may flow 270 CFM at .500 lift. How about flow at lower lifts? To even take advantage of the flow at high lift you need to have a camshaft that has that high of a lift in the first place. The flow at low, mid and high lift have to balanced a certain way to net the most effective power curve. Most of this is done through different valve jobs, what works on one particular head may not work on another. We have worked with a head porter and developed a CNC program that not only brings consistent quality and performance, but also makes the most power of any head that we’ve tested, ours and the competitions

Here are some of the basic specs on the head:

Flow #’s.

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

Why do we do flow every .050″? Because low lift flow is important and so is good data resolution.

Intake Valve: S.S. +1mm oversize
Exhaust Valve: Inconel +1mm oversize
Valveguides: Manganese bronze
Valve springs: Dual valve springs with titanium retainers, good for 10,000 rpm and high lift camshafts
Hand finishing of runner, blending of bowl area, and chambers.

Now for the results and eye candy. We’ll have more pics & even video of the CNC process coming up soon.

This was tested on my car with Tomei 280 cams, AMS VSR intake manifold, stock TB, AMS FMIC, full 3″ exhaust. AMS GT35R turbo kit, 2.0L 9:1 compression. Timing was conservative for testing purposes.

24psi = 557whp!!!
This graph shows the three heads that we were working on and the development of power after each improvement!

Pricing:

AMS CNC EVO 8 Head – New head, no core needed – $3995.00
AMS CNC EVO 9 Head – New head, no core needed – $4095.00

AMS CNC EVO 8 Head – With Core – $2595
AMS CNC EVO 9 Head – With Core – $2695
Core heads are stripped, cleaned, new guides, seals, ect.

THE ULTIMATE IN PERFORMANCE

The goal of AMS is to provide the highest quality, best performing products available.
By utilizing research and development and rigorous testing programs AMS will never compromise the quality or performance of our products.

SHOP PARTS

NOT LEGAL FOR USE ON POLLUTION CONTROLLED MOTOR VEHICLES. THIS PRODUCT IS FOR RACING COMPETITION ONLY AND IS NOT LEGAL FOR USE ON HIGHWAY OR STREET VEHICLES, OR OTHER NON-RACING COMPETITION OFF-ROAD VEHICLES.

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This policy only applies to installers and/or users who are in the United States, customers who reside in other countries should act in accordance with their local laws and regulations.

Some AMS Performance upgrades may solely be used on vehicles in sanctioned competition which may never be used upon a public road or highway, unless permitted by specific regulatory exemptions (such as a CARB E.O.). For state specific details please visit the following website: http://www.semasan.com/emissions

It is the responsibility of the installer and/or user of the product to ensure that it is used in compliance with all applicable laws and regulations. If a product was purchased in error, do not install and/or use it. The purchaser must arrange to return the product(s) for a full refund.

All performance modifications and installations are at the customer’s own risk. AMS Performance holds no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products.

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