This Ultra Lo-Ram intake manifold is designed for GM LS Gen III/IV engines with LS1/2/6 cathedral-port cylinder heads and is built for forced-induction (supercharged or turbocharged) applications. Its front-feed plenum entry provides a very low-profile modular design suitable for turbocharged or centrifugally supercharged engines, with a lower overall height to fit under a stock or mildly modified hood.
Specifications:
- Engine: GM LS1/LS2/LS6 (cathedral port)
- Manifold Type: Ultra Lo-Ram, front-feed, single injector
- Finish: Natural
- Material: Cast aluminum
- Basic Operating RPM Range: 3,500-8,000
- Throttle Body Bore: 105mm, gasket included
- Maximum Height: 6.86" with throttle body adapter
- Fuel Rails: High-volume, 3/4"-16 O-ring (-8AN) ports, mounting hardware included
- Recommended Use: Forced induction
- Part Number: 300-621
Fuel rail kits include two sets of brackets — one for standard-length injectors and one for short injectors (such as Pico or LS7). Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification.
FAQ
What cylinder heads does this manifold work with?
It's designed for GM LS Gen III/IV engines with LS1/2/6 (cathedral port) cylinder heads, OE or aftermarket.
Will this manifold clear stock hoods?
Yes, its low front-feed profile clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification.
What injector lengths does the fuel rail kit support?
It comes with brackets for both standard-length and short (Pico/LS7-style) injectors.
