HIGH-PERFORMANCE SINGLE PLANE EFI INTAKE MANIFOLD - FOR GM LS V8 ENGINES
[PRODUCT DESCRIPTION]
Premium quality heavy-duty cast aluminum single plane EFI intake manifold designed for GM Gen III/IV LS-based V8 engines.
Features precision-machined fuel rail/injector bosses and a standard 4150-style square-bore throttle body flange.
Perfect for high-RPM performance, custom EFI conversions, and forced induction (turbo/supercharger) setups.
⚠️ IMPORTANT FITMENT NOTE：
• Fits CATHEDRAL PORT cylinder heads only!
• Will NOT fit rectangular port (LS3/L92) or LS7 heads.
• Please verify your cylinder head port shape before purchasing.
[DETAILED TECHNICAL SPECIFICATIONS]
Intake Manifold:
Throttle Flange Bolt Pattern: 5.623" x 5.157" (Standard 4150 Square Bore)
Manifold Height: 6.744"
Flange Overall Width: 13.193"
Flange Port Angle: 110°
Cylinder Head Port Bolt Distance: 4.402" / 2.343" (10X Ø0.315" Thru Holes)
Throttle Pad Mount Thread: 5/16-18 UNC x 0.59"
Fuel Rails:
Material: High-Flow Billet Aluminum
Total Length: 15.75" (400 mm)
Mounting Hole Distance: 10.78" (273.9 mm) / 2X 0.28" (Ø7mm) Thru Holes
Inlet/Outlet Port Thread: 2X 3/4-16 UNF (Standard -8 AN ORB)
Injector Bore Size: 4X 0.54" (Ø13.8 mm) / Fits standard 14mm O-ring injectors
Injector Rail Mount Thread: M6 x 0.47"
[VEHICLE COMPATIBILITY]
This manifold is compatible with Chevrolet LS V8 Gas Gen III/IV engines with Cathedral Port heads:
- 5.7L / 350 cu.in. (1997 - 2004) -> Fits LS1, LS6 Engines
- 6.0L / 364 cu.in. (1999 - 2007) -> Fits LS2, LQ4, LQ9 (Cathedral Port Versions)
- 5.3L / 325 cu.in. (1999 - 2014) -> Fits LM7, L59, LM4, L33, etc.
- 4.8L / 294 cu.in. (1999 - 2017) -> Fits LR4, LY2, L20, etc.
[KEY FEATURES]
• Premium Cast Aluminum: Heavy-duty construction ensures excellent heat dissipation and structural integrity under high boost or vacuum conditions.
• Precision Machined: Pre-drilled M6 fuel rail holes and exact injector bosses ensure a leak-free fuel delivery setup.
• Optimum Airflow: Single-plane design optimized for mid-to-high RPM power bands, expanding your engine's horsepower potential.
[PACKAGE INCLUDES]
• 1 x Aluminum Single Plane EFI Intake Manifold
• 2 x High-Flow Fuel Rails & Mounting Hardware