Introduction: A New Standard for LS3 Cylinder Heads
If you're in the market for a high-performance LS3 cylinder head, Frankenstein Engine Dynamics’ MONSTER™ M311 is the benchmark. Backed by 15+ years of championship-proven R&D across NHRA®, ProStock®, and Top Fuel®, the M311 is designed to push the limits of what an LS3 head can deliver—naturally aspirated or boosted.
Beyond the Flow Bench: Reactive Airflow Modeling
Most cylinder heads chase big flow numbers. At FED, we go deeper. Our proprietary Reactive Airflow Modeling ensures optimized:
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Air Speed
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Air Velocity
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Air Density
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Air Pressure
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Total Flow
These elements are crucial for mid-to-upper RPM performance where real horsepower is made. By analyzing the full induction system—including camshaft, intake, and power adder—we fine-tune the LS3 cylinder head to support stable combustion and efficient fuel dispersion.
Chamber Shape & Port Geometry: Built for Efficiency
What makes the MONSTER cylinder head so effective is its balance of airflow and combustion science. Every aspect was engineered with thermodynamics and tested through hundreds of hours of CFD and dyno validation.
Key features include:
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Shallow 11° valve angle
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Precision-shaped throat & bowl
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45° intake seat with Newen CNC valve job
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O-ringed M311 exhaust ports with Hi-Temp silicone for leak-free sealing
These elements create an LS3 head that supports increased pressure recovery, minimal shrouding, and peak volumetric efficiency across the RPM range.
Rocker Stability & Valve Train Engineering
Valve train instability kills power—and reliability. We engineered the M311’s geometry to ensure a 10% increase in valve lift, from .600" to .660", without compromising durability.
FED’s use of Spintron® laser tracking ensures every valve train configuration we recommend is tested and race-proven. Whether you're running aggressive cams, higher RPMs, or forced induction, we can match you with the perfect setup—from pushrods to springs.
MONSTER™ LS3 APPLICATIONS
A different kind of precision. Frankenstein’s advanced development capabilities enable us to fine tune cylinder heads for specific applications. Reactive Airflow Modeling, a proprietary method of induction development, enables us to establish optimal designs and configurations to deliver desired performance.
The performance insights FED possesses allows us to offer tailored cylinder heads in addition to a myriad of custom services, upgrades and component options.
MONSTER™ – M311
- The “Gate Keeper” of all aftermarket LS3 heads, naturally aspirated and boosted applications up to 1000hp (with tuning and supported modifications).
- 4″ bore minimum applications and compatible with both factory and aftermarket LS blocks, from 6.0L truck engine to 427ci race engines.
- Uses stock LS3 rocker arms with FED’s billet rocker stand (part no. 913001).
- Premier Stainless Severe Duty Valves and Bronze Guides
- Fits all standard equipment: valve covers, headers, LS3 Intakes, OEM-type SBC Rocker Arms.
BOOST MONSTER™ – M311
- Built for larger turbos, power adders such as 2650 superchargers™, producing 1000hp+ (with tuning and supported modifications).
- Available upgrades include CrN coated Ti valves for higher rpm, 7500rpm+, and 1300hp+ applications.
- 4″ bore minimum applications and compatible with both factory and aftermarket LS blocks, from 6.0L truck engine to 427ci race engines.
- Uses stock LS3 rocker arms with FED’s billet rocker stand (part no. 913001).
- Premier stainless severe duty intake valves, Inconel exhaust valves and CHE Bronze Guides
- Fits all standard equipment: valve covers, headers, LS3 Intakes, OEM-type SBC Rocker Arms.
BOOST MONSTER PLUS™ – M311
- Built for “plus sized” units with higher compression applications (13:1+).
- Higher rpm (7500+) and/or higher cubic inch builds (427ci+)
- Higher boost levels (30psi+)
- Premier stainless severe duty intake valves, Inconel exhaust valves and CHE Bronze Guides
- Fits all standard equipment: valve covers, headers, LS3 Intakes, OEM-type SBC Rocker Arms.
