Looking for a great replacement or upgrade over your stock LS3-style rectangular port cylinder heads? The Brawler Series CNC LS3 heads are modeled after a factory GM LS3 head casting and treated to the full Texas Speed/PRC 257cc port job, providing maximum 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. Dyno tested to deliver over 25 rear-wheel horsepower gains over stock 6.2L cylinder heads on a stock displacement engine.
Note: These heads will also fit LS2 LQ4 and LQ9 blocks when used with a rectangular port intake manifold and LS3-style rocker arms.
Features:
- Same CNC Porting as GM PRC Ported LS3 Heads — 257cc intake port for substantial airflow improvement
- CNC 5-Angle Valve Job — Precision valve seat machining for optimal seal and flow
- Approx. 71cc 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 — 2.165" hollow stem intake, 1.60" stainless exhaust
- Fully Assembled and Tested — Ready to install out of the box
- Dyno Tested — 25+ RWHP gains over stock 6.2L cylinder heads
Compatible Applications:
LS3, L92, L99, LSA, and LS9 rectangular port engines and engine swaps. Also compatible with LS2 LQ4 and LQ9 blocks when paired with a rectangular port intake manifold and LS3-style rocker arms.
Frequently Asked Questions:
Q: What engines are these heads compatible with?
These heads are designed as a direct replacement or upgrade for LS3, L92, L99, LSA, and LS9 rectangular port cylinder heads. They also fit LS2 LQ4 and LQ9 blocks when used with a rectangular port intake manifold and LS3-style rocker arms.
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?
2.165" hollow stem stainless steel intake valves and 1.60" stainless steel exhaust valves.
Q: How much horsepower do these heads add?
These heads are dyno tested to deliver over 25 rear-wheel horsepower gains over stock 6.2L cylinder heads on a stock displacement engine.
Q: What is the intake port size?
257cc, matching the full Texas Speed/PRC port job used on GM PRC ported LS3 heads.
Q: What is the combustion chamber size?
Approximately 71cc.
Q: Do these heads require additional machining or assembly before installation?
No. These heads ship fully assembled and tested, ready for installation.
