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Air and Fuel› Intake Manifolds and Components
Holley
6.2L LT1 Hi-Ram Intake Manifold 1x105mm TB
SKU: H00E 300-142
Moderate — 2–4 hours
Overview
This intake offers optional injector bosses on the runners for increased performance potential when used with additional injectors alongside factory direct injection. It is constructed from aluminum and has a plenum volume of 549 cubic inches, with a power band optimized for 3500-8000+ RPM. The manifold is intended for performance applications and is not legal for sale or use on emissions-controlled vehicles.
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Part #: 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:
- Modular Design w/ Removable Top
- Overall Height: 13.34" (w/ EFI Top - 95mm or 105mm) - See Drawing
- A-B Height: 12.10" (w/ Carb Style Top - 2 x 4150 or 2 x 4500) - See Drawing
- Height at Plenum Flange: 9.44"
- Port Size: 2.06" High x 1.53" Wide
- Runner Length: Approx. 6.5"
- Large Plenum Volume of 549 Cubic Inches (w/ 1 x 95mm or 1 x 105mm Throttle Body Top)
- Available With or Without Injector Ports in the Runners
- 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
- Rear of Plenum Machined for MAP & 3 Vacuum Ports
- 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
- O-Ring Seals at Cylinder Heads & Plenum Top
- Easy Assembly w/ Top Mounted Screws on Plenum Top (all except front 2 screws)
- Several Top Options: 1 x 95mm, 1 x 105mm, 2 x 4150, 2 x 4500, or Blank Flange for Custom Throttle Bodies
- 3500-8000+ RPM Power Band
GM Gen V LT1 Hi-Ram, 1 x 105mm LS Throttle Body (Longitudinal Mount) w/out Port EFI Provisions
Vehicle Symptoms
- power falls off sharply at high rpm
- engine feels starved for air at wide open throttle
- fuel trims run lean under heavy load
- not enough airflow for supercharger setup
- top-end pull feels flat after cam swap
Relevant Conversations
- Holley Hi-Ram LT1 intake manifold dyno results
- Hi-Ram vs MSD Atomic LT1 intake manifold comparison
- LT1 high rpm power drop after cam swap fix
- Holley 300-142 Hi-Ram install guide C7 Corvette
- Hi-Ram intake manifold with port injection fuel rails
- Will Hi-Ram fit under stock Corvette hood?
- LT1 E85 port injection conversion with Hi-Ram
- Holley Hi-Ram supercharger clearance LT1
- Hi-Ram intake manifold throttle body size recommendation
- LT1 P0171 lean code after intake manifold install
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
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Specifications
| Brand | Holley |
| Part Number | H00E 300-142 |
| Weight | 28.0 lb |
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