Holley 300-142 Hi-Ram Intake Manifold - GM LT1

GM Gen V LT1 Hi-Ram, 1 x 105mm LS Throttle Body (Longitudinal Mount) w/out Port EFI Provisions

Part Number: 300-142

The new Holley EFI Hi-Ram intake provides the ultimate performance with the new GM direct injected Gen V 6.2L LT1 engine. The modular design of this manifold allows easy disassembly for custom porting, multiple tops, or custom induction systems. Each runner has a large radius where it meets the plenum, and optimized taper & cross-sectional area to perform in a wide variety of engine configurations. The optional injector bosses on the intake runners allow increased performance potential by using additional injectors along with the factory direct injection. When you look for the pinnacle of performance, price, and quality, look to Holley EFI.

Features and Benefits

• Head Flange has Clearance for Fuel Supply to High Pressure Pump
• Intakes w/ Injector Ports Include Fuel Rails w/ Dual Mounting (1.48” or 2.56” O-ring to O-ring injector length)
• O-Ring Seals at Cylinder Heads & Plenum Top
• Port Size: 2.06” High x 1.53” Wide
• 3500-8000+ RPM Power Band
• Large Plenum Volume of 549 Cubic Inches (w/ 1 x 95mm or 1 x 105mm Throttle Body Top)
• Rear of Plenum Machined for MAP & 3 Vacuum Ports
• A-B Height: 12.10” (w/ Carb Style Top - 2 x 4150 or 2 x 4500) – See Drawing
• Modular Design w/ Removable Top
• Overall Height: 13.34” (w/ EFI Top - 95mm or 105mm) – See Drawing
• Height at Plenum Flange: 9.44”
• Fuel Rails are Anodized, Laser Etched, and Machined for 8AN O-Ring Fittings at Each End
• Available With or Without Injector Ports in the Runners
• Several Top Options: 1 x 95mm, 1 x 105mm, 2 x 4150, 2 x 4500, or Blank Flange for Custom Throttle Bodies
• Easy Assembly w/ Top Mounted Screws on Plenum Top (all except front 2 screws)
• Increased Runner Wall Thickness for Custom Porting at the Plenum to Runner Entry on Each Runner
• Runner Length: Approx. 6.5”

*** The front and rear height measurements listed in the Specs section are referencing the overall height with the top plate installed. Please see the diagrams in the product images for other dimensions.