The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are meticulously crafted for GM LS Gen III and IV engines featuring GM LS1/2/6 (cathedral port) cylinder heads. Compatible with both OE (Original Equipment) and aftermarket cylinder heads, these intake manifold and rail kits are versatile and cater to various fuel supply strategies.
The 300-625 (satin) & 300-625BK (black) intake manifold kits are equipped with two injectors per cylinder to meet high-volume fuel demands, providing flexibility in fuel supply strategies and supporting dual-fuel capability. Additionally, the kit features a standard 6-1/8" x 3-1/8" burst panel flange, allowing for the installation of SFI approved burst panels, frame sets, and gaskets available from various manufacturers such as Allstar Performance or Specialty Fasteners.
Designed for high-boost turbocharged or supercharged induction systems, the short runner, low-profile base intake manifold boasts a compact overall height not achievable with other existing intake manifolds. Specifically configured for a 105mm throttle body (see Holley P/N 112-581 or similar models), the fuel rail kits come with two sets of brackets—one for long fuel injectors (usually standard length) and another for short injectors like Pico or LS7.
Holley Lo-Ram intake manifold kits include all necessary sealing o-rings, plugs, and fasteners required for a hassle-free installation.
- Designed for GM LS Gen III and IV engines with GM LS1/2/6 (cathedral port) cylinder heads
- Optimal performance for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm (application-dependent)
- Dual-injector, separate-passage, high-volume fuel rails with mounting hardware, supporting dual-fuel capability, and featuring 8 AN o-ring ports
- Plenum top machined for a standard “large” 6-1/8” x 3-1/8” burst panel
- Modular LS1 Lo-Ram design for user customization
- Low height and compact packaging for installation in most applications, often under stock hoods
- Available in both as-cast satin and black power-coat finishes
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