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Air and Fuel Intake Manifolds and Components

Holley

Lo-Ram Intake Manifold Kit LS1/LS2/LS6 Frt Feed

$1,153.95 $1,099.95 Save $54.00

SKU: H00E 300-621BK

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In Stock
Ships by Aug 4
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: 300-621BK

The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm throttle body part number 112-581 or similar models. The base intake manifold is designed with a lower overall height to fit under a stock or mildly modified hood.

Features:

  • Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads
  • Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
  • With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used
  • Modular design allowing the use of front-feed plenum entry
  • Intake design facilitates custom inlet duct and throttle body placement
  • Low height to fit under a stock or mildly modified hood.
  • Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
  • Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
  • High volume fuel rails and mounting hardware included with ┬╛"-16 o-ring ports (8 AN)

Ultra Lo-Ram Manifold Kit - LS1/2/6-Black Finish

MIA's Description

Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are for GM LS Gen III and IV engines with LS1/2/6 (cathedral port) cylinder heads (OE or aftermarket). Designed for forced induction (supercharged or turbocharged) applications, it works with a 105 mm throttle body (P/N 112-581 or similar). The low-profile design fits under stock or mildly modified hoods. The 300-621 Lo-Ram plenum entry provides a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. Fuel rail kits include brackets for both long (standard length) and short (Pico, LS7) fuel injectors.

Fitment

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Specifications

BrandHolley
Part NumberH00E 300-621BK
Weight30.51 lb

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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