Holley 350 / 500 to 20R Manifold Adapter Kit
We manufacture these billet aluminum carb adapters in house, to our specs, and only use the finest materials in our adapters to assure the quality you would expect from LC Engineering. These are CNC machined out of a solid piece of aluminum and fit perfectly. Our adapters allow you to use a Holley 350 / 500 2-barrel carb to your stock 20R intake. These are not a one-size-fits-all adapter like others on the market. Ours are designed to fit a specific carburetor and intake manifold to allow perfect fitment. Carb spacers work by increasing the plenum size and offering a smooth transition from the carburetor to the intake manifold. The spacer is 1" thick and will come with gaskets. For optimum performance, blending may be required
Contact our Tech Support Line for further information at 928-575-2174.
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Note: Images are for illustration purposes only. Images may not represent the product listed. Please contact customer service with any questions or concerns: 1-928-505-2501.
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Since the Holley carburetor bores are so much larger than the stock manifold you will want to port match your manifold to our adapter for optimal performance. LC Engineering recommends pre-installing the adapter up to your manifold to see where you will need to port match the manifold.
Kit Includes:
(6) M8-1.25 x 45mm Full Thread Stud
(6) M8-1.25 Nyloc Nuts
(8) M8 Washer
(2) M8-1.25 x 25mm Socket Head Cap Screw
(1) Holley Base Gasket
(1) Adapter to Stock 22R Manifold Gasket
(1) Holley 350/500 Carb to 22R Manifold Adapter
- Pre-install the adapter onto your manifold (no gaskets). Inspect the manifold opening and mark area to be port matched. Any port work should be done with the manifold off the engine. Make sure to clean the manifold thoroughly after porting. Install the four supplied studs into the top and bottom of your new adapter. Use a small amount of thread locker onto studs prior to installation into manifold.
- Lightly coat lower gasket with white lithium grease on both sides (to help seal better) and install onto your manifold. Set your new adapter on top of the gasket.
- Install adapter on intake manifold using the supplied allen bolts and wave washers to attach adapter to manifold. Two bolts on top and two studs with washers and nuts on bottom. Use a small amount of thread locker onto hardware prior to installation.
- Lightly coat carburetor gasket with white lithium grease on both sides (to help seal better). Install your carburetor onto the adapter and use washers and Nyloc nuts to tighten down. Do Not over tighten nuts or damage may accrue to the carb base.
Adapter plate 
