Sale

Air and Fuel› Intake Manifolds and Components

Holley

Hi-Ram Cathedral Port Intake Manifold

$1,349.95 $1,213.95 Save $136.00

SKU: HLY-300-123BK

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Holley Hi-Ram intake manifold is a black ceramic-coated, cast aluminum component designed for LS1, LS2, and LS6 engines. It features cathedral port heads and a 105mm throttle body bore. The runner length is 6.58 inches, with a tapered cross-sectional area. This manifold is intended for naturally aspirated or forced induction engines in the 6.0 to 7.0+ liter range, operating optimally between Idle-8,000 RPM.
Show original supplier description
The Holley Hi-Ram intake manifold is a high-performance, cast aluminum component engineered for LS1, LS2, and LS6 engines utilizing cathedral port cylinder heads. This black ceramic-coated unit is designed to accept a 105mm throttle body. Its modular base allows for a wide range of carbureted and EFI tops, making it suitable for custom induction systems and high-performance applications where height is not a limitation. The manifold features a runner length of 6.58 inches with a tapered cross-sectional area ranging from 4.25 to 2.53 square inches. The base plenum top mounting flange height is 8.42 inches from the engine block lifter valley cover flange. With the 92/105mm EFI plenum top installed, the total height reaches 12.32 inches. The port size for LS3 heads is 2.49 inches high by 1.21 inches wide, while for LS1/LS2/LS6 it is 3.18 inches high by 0.98 inches wide. This intake is intended for N/A or forced induction engines in the 6.0 to 7.0+ liter range, with a maximum power potential at 7000-8000+ RPM. It is recommended for applications such as drag racing, muscle cars, marine, off-road, sandrails, pulling trucks, track, and street-rod builds. The product comes with a 90-day manufacturer's limited warranty. Please note that this part is legal for sale or use on Racing Use Only Vehicles, meaning vehicles used exclusively for competition that are not registered and may never be used on the street. It is against the law to install this part on an emissions-controlled vehicle.

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.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandHolley
Part NumberHLY-300-123BK
CategoryAir and Fuel
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

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.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy