Looking for a great replacement or upgrade over your stock LS1/LS6-style cathedral port cylinder heads? The Brawler Series CNC LS6 heads are inspired by the factory GM LS6 cylinder head casting, fully CNC ported using the same program as GM PRC ported LS6 heads, and built to provide an incredible value for customers wanting to upgrade from stock heads on a budget. Each head is fully assembled and tested before shipping, equipped with TSP stainless steel valves, a TSP/PAC dual .660" spring kit, and titanium retainers.
Features:
- Same CNC Porting as GM PRC Ported LS6 Heads — Proven porting program for improved airflow
- CNC 5-Angle Valve Job — Precision valve seat machining for optimal seal and flow
- 64cc Combustion Chamber
- TSP/PAC .660" Spring Kit — Supports aggressive camshaft profiles
- TSP Titanium Retainers — Reduced valvetrain weight for higher RPM stability
- TSP Stainless Steel Valves — 2.02" intake, 1.57" exhaust
- CHE Bronze Guides
- Fully Assembled and Tested — Ready to install out of the box
Flow Data — Brawler LS6 Heads:
| Valve Lift | Intake Flow | Exhaust Flow |
|---|---|---|
| .200" | 147 CFM | 114 CFM |
| .300" | 207 CFM | 152 CFM |
| .400" | 255 CFM | 191 CFM |
| .500" | 292 CFM | 207 CFM |
| .600" | 316 CFM | 226 CFM |
Compatible Applications:
LS1 and LS6 cathedral port engines and engine swaps. Compatible with any Gen III LS cathedral port block accepting an LS1/LS6-style head casting.
Frequently Asked Questions:
Q: What engines are these heads compatible with?
These heads are designed as a direct replacement or upgrade for LS1 and LS6 cathedral port cylinder heads, compatible with Gen III LS cathedral port engine applications and swaps.
Q: Do these heads come fully assembled?
Yes. Each head is fully assembled and tested with valves, springs, retainers, and guides already installed.
Q: What valve springs are used?
A TSP/PAC dual .660" spring kit is included, supporting aggressive camshaft profiles for performance applications.
Q: What size valves do these heads use?
2.02" stainless steel intake valves and 1.57" stainless steel exhaust valves.
Q: How do these compare to stock cathedral port heads?
These heads use the same CNC porting program as GM PRC ported LS6 heads, delivering substantially improved airflow over stock castings at every point in the lift curve, based on the included flow chart data.
Q: What is the combustion chamber size?
64cc.
Q: Do these heads require additional machining or assembly before installation?
No. These heads ship fully assembled and tested, ready for installation.