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 late April 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 late April. Pre-order now to secure your set!
Product Videos
Custom Field
Product Reviews
1 Review Hide Reviews Show Reviews
-
M115 Frankenstein monster series heads
Easiest bolt on power there is only buy fed heads from now on they're pricey but worth every penny! Thanks Michigan Motorsports for having them IN STOCK.
