Product Description
Frankenstein M115 6-Bolt 240cc Cathedral Port Cylinder Head (SET)
Fits 3.780" and Larger Bore LS Engines when used with 4.030" or larger Head Gaskets
4.8L 5.3L 5.7L 6.0L LS1 LS2 LS6 LQ4 LQ9 LM7 LC9 L33 LH6
In Stock, Ready to Ship!
The new Monster Series M115 240cc Cathedral Cylinder Heads are engineered for serious performance enthusiasts seeking maximum power and reliability. Fully CNC-ported and assembled with high-quality components, these heads deliver exceptional airflow and combustion efficiency, making them ideal for both high-performance street builds and racing applications.
Designed to support high-rpm stock bottom end combinations as well as larger displacement stroker engines, the new M115 heads feature 5-axis CNC-ported intake runners, exhaust ports, and combustion chambers, all meticulously hand-blended and deburred for optimal airflow and consistency.
With impressive flow numbers and carefully engineered port geometry, the M115 heads set a high benchmark for small-bore LS performance. For builders looking to maximize power from a 3.780" bore LS platform, the M115 cylinder heads deliver the airflow and durability needed for demanding builds.
Premium Components:
- 2.040" FED Stainless Steel Severe Duty Intake Valves
- 1.575" FED Stainless Steel Exhaust Valves
- Custom PAC Dual Valve Spring Kit (.700 Lift) 153 lbs @1.800" Installed Height | 456 LBS @ 1.100" Open Pressure
- Titanium Retainers
Specifications:
- Fully CNC-Ported Design
- 240cc Intake Port
- 96cc Exhaust Port
- 64cc Combustion Chamber
- 15 Degree Valve Angle
Proven Flow Performance:
- Intake Flow: 320 CFM
- Exhaust Flow: 249 CFM
Additional Notes:
- Minimum Bore Size: 3.780"
- Requires 4.030" Bore Head Gasket Due to Chamber Size
- Exhaust Gaskets: Uses Standard GM LS Exhaust Gaskets
- Spark Plugs: Compatible with .750" Reach Gasket Seat of .708" Reach Tapered Seat Plugs
- Rockers: Accepts Standard LS1 Style Rocker Arms
- Rocker Stands: Uses OEM GM Cathedral Port Rocker Stands or Michigan Motorsports Billet Stands (not included)
- Sold as a Complete Set
Fits: LS1 LS2 LS6 LQ4 LQ9 LR4 LM7 L59 L33 LM4 LS4 LY2 L20 LY5 LMG LMF LH6 LC9 when used with a cathedral port intake manifold and 4.030" + bore head gaskets.
