Holley 300-236 Hi-Ram Lower Manifold - GM LT1

LT1 Hi-Ram, Lower Manifold Only w/Port EFI Provisions & Fuel Rails. Order Plenum Top Separately.

Part Number: 300-236

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

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

The versions of the LT1 Hi-Ram intake manifold with port EFI provisions and fuel rails are designed to accept Bosch Style EV-1 or GM LS7 fuel injectors