This Lo-Ram intake manifold kit 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. The low-profile base manifold is designed to package with a plenum-mounted air-to-water intercooler in a top-feed configuration.
Specifications:
- Engine: GM LS1/LS2/LS6 (cathedral port)
- Manifold Type: Lo-Ram, top-feed, single injector
- Finish: Natural/satin
- Material: Cast aluminum
- Basic Operating RPM Range: 3,500-8,000
- Throttle Body Bore: 105mm, gasket included
- Maximum Height: 9.07" without intercooler
- Fuel Rails: High-volume, 3/4"-16 O-ring (-8AN) ports, mounting hardware included
- Burst Panel Compatible: Yes
- Recommended Use: Forced induction
- Part Number: 300-620
Fuel rail kits include two sets of brackets — one for standard-length injectors and one for short injectors (such as Pico or LS7).
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.
Is this manifold intended for forced induction?
Yes, it's designed for supercharged or turbocharged applications and pairs with a 105mm throttle body.
Is this manifold burst panel compatible?
Yes, this manifold is burst panel compatible.

