This is an OE replacement intake manifold for LS3 style engines with rectangle port cylinder heads. It is a composite plastic plenum in black, a standard deck height design, and fits the rectangle port LS family covering 6.0L and 6.2L applications.
Specifications:
- Intake Manifold
- OE Replacement
- Plenum
- Standard Deck
- Rectangle Port
- Plastic
- Black
- LS3
- GM LS-Series
- Sold as: Each
- Part number: 12686561
Applications:
- GM LS-Series engines with rectangle port cylinder heads (LS3, L92, L76)
- 6.0L and 6.2L LS applications
FAQ
What cylinder heads does this manifold require?
It is designed for rectangle port LS heads such as LS3, L92, and L76.
What is it made of?
It is a composite plastic plenum in a black finish.
Is it a standard or tall deck design?
It is a standard deck height intake manifold.
Does it fit cathedral port LS heads?
No. It is a rectangle port manifold and does not fit cathedral port heads.

