Product Description
Frankenstein M115 Monster Series Cathedral Port LS1 Cylinder Head Pair
Fits 3.780" and Larger Bore LS Engines when used with 4.030" or larger Head Gaskets
Currently accepting pre-orders. Expected to ship mid-February 2025
The Monster Series M115 235cc LS1 Cylinder Heads are engineered for serious performance enthusiasts seeking unmatched power and reliability. Fully CNC-ported and constructed with high-quality components, these heads deliver exceptional airflow and combustion efficiency, making them ideal for racing applications as well as high performance street builds.
Designed to feed high-RPM stock bottom ends or larger displacement stroker engines, the M115 heads feature a 5-Axis CNC ported intake and exhaust chambers, meticulously hand-blended and deburred for maximum performance. They provide exceptional flow characteristics, with flow testing that sets a benchmark in the industry. For those who demand maximum power from their small-bore LS engine, the M115 cylinder heads are the ultimate choice!
Key Features:
• Fully CNC Ported: Featuring a 235cc intake port and 96cc exhaust port, with a 62cc combustion chamber volume and 15 degree valve angle, these heads maximize airflow and provide increased power potential for both street and race builds.
• Proven Performance: The 235cc intake port has been flow bench tested to an impressive 326cfm on the intake side and 260cfm on the exhaust side, providing the airflow needed for high-performance builds.
• Perfect for High-Rev and Stroker Builds: Ideal for high-RPM stock bottom end builds or larger displacement stroker engines, these heads are engineered to meet the airflow demands of aggressive applications.
• Premium Components:
• Black Nitride Stainless Steel Severe Duty Valves
• Custom PAC .700” Lift Valve Springs for Hydraulic Roller Camshafts, includes Titanium Retainers
• 4 Bolt Pattern: For use on factory 4 bolt blocks
Specifications:
- Minimum Bore Diameter: 3.780”
- Intake Port Volume: 235cc
- Exhaust Port Volume: 96cc
- Combustion Chamber Volume: 62cc
- Intake Valves: FED Prime Grade Stainless Steel 2.040”
- Exhaust Valves: FED Prime Grade Stainless Steel 1.575”
- PAC Valve Springs: Dual .700” for Hydraulic Roller
- Retainers: FED Titanium-64 – LS Dual Spring
- Valve Locks: GM Valve Locks
- Valve Seals: Viton High Heat Seal
- Exhaust Gaskets: Uses Standard GM LS Exhaust Gaskets
- Head Gaskets: Requires head gaskets with a minimum 4.030" bore size.
- Spark Plugs: Compatible with .750” Reach Gasket Seat or .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 LS1 Stands (not included)
Heads Sold/Priced as a pair
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.
Note: Our next M115 batch is in production, with an estimated completion in mid-February. Pre-order now to secure your set!
