Free US Shipping·Ships in 24 Hours from CA & GA·30-Day Free Returns·1-Year Warranty
- Free shipping, ships within 24 hours from our California & Georgia warehouses
- 30-day free returns, we pay return shipping
- 1-year warranty on casting defects
- Made in our own factory, leak-tested and inspected before it ships
LS0811BK Cathedral Port to Rectangle Port Intake Adapter Kit
A pair of billet aluminum adapter plates that let you run a rectangle port intake manifold (LS3, LSA, ZL1, CTS-V style), supercharger or blower on an LS engine with cathedral port heads.
- 6061 billet aluminum, black anodized
- Plates are 1/2 in. tall
- O-rings and bolts included
Before you order:
- For cathedral port heads only (LS1, LS2, LS6 and most 4.8 / 5.3 / 6.0 truck engines).
- Will not fit raised port LS7 intakes.
- The plates raise the intake 1/2 in., so check hood and accessory clearance.
What's Included
- 2 × adapter plates
- 8 × O-rings
- 10 × bolts
Why Buy from Haytalras
- Ships from the US. Free shipping from our California and Georgia warehouses, out the door within 24 hours, usually delivered in 3–7 days.
- Easy returns. 30-day free returns.
Frequently Asked Questions
Which LS engines are cathedral port?
LS1, LS6, LS2 and most 4.8L / 5.3L / 6.0L truck engines. LS3, L92 and L99 already have rectangle ports and do not need this kit. See our LS intake guide.
Not sure it fits?
Email haytalras@gmail.com with your engine and intake and we'll confirm before you order.
Shipping
- Orders ship within 24 hours on business days from our US warehouses in Ontario, California and Bloomingdale, Georgia.
- Most US orders arrive within 3–7 days after shipping. A tracking number is emailed as soon as your package leaves the warehouse.
- Need a part urgently? Email us and we'll check stock at the closest warehouse.
Returns
- Eligible items can be returned free of charge within 30 days of delivery.
- Please contact us at haytalras@gmail.com before sending anything back so we can set up your return.
- We recommend a test fit as soon as your package arrives, before final assembly.
Full details: Returns & Warranty
Related Products
More GM LS parts from Haytalras.
-10%
Haytalras 300-122 GM LS1 LS2 LS6 Cathedral Port 92mm Hi-Ram EFI Intake Manifold 5.7L 6.0L
300-122 Hi-Ram EFI Intake Manifold for Cathedral Port LS A 92mm Hi-Ram EFI intake manifold for GM LS1, LS2 and LS6 engines with cathedral port cylinder heads (5.7L / 6.0L,...
-10%
$439.99
$489.99
-10%
Haytalras 300-123 GM LS1 LS2 LS6 Cathedral Port 102mm Hi-Ram EFI Intake Manifold 5.7L 6.0L
300-123 102mm Hi-Ram EFI Intake Manifold for Cathedral Port LS A Hi-Ram EFI intake manifold with a large 102mm throttle body opening for GM LS1, LS2 and LS6 engines with...
-10%
$459.99
$509.99
-10%
Haytalras 534-218 Fuel Rail Kits for LS Series Gen III/IV EFI Engines LS1 LS2 LS6 LS3 L92
534-218 Fuel Rail Kit for 300-136 / 300-137 LS EFI Intakes A pair of black aluminum fuel rails for our 300-136 (rectangle port) and 300-137 (cathedral port) single-plane EFI intake...
-10%
$62.99
$69.99
-14%
Haytalras 300-116 GM LS3 L92 Rectangle Port 92mm Hi-Ram EFI Intake Manifold 6.0L 6.2L
300-116 Hi-Ram EFI Intake Manifold for Rectangle Port LS A 92mm Hi-Ram EFI intake manifold for GM LS engines with rectangle port heads (LS3, L76, L92, L99). Built for big-cube,...
-14%
$359.99
$419.99
Haytalras 302-1 GM LS Swap Low-Profile Rear Sump Oil Pan Kit 1955-1987 4.8L-6.2L
302-1 Low-Profile Rear Sump LS Swap Oil Pan Kit The Haytalras 302-1 oil pan is a cast-aluminum, low-profile rear-sump oil pan for putting a GM Gen III/IV LS engine into...
$119.99
Haytalras 300-137 GM LS1 LS2 LS6 Cathedral Port Mid-Rise Single Plane 4150 EFI Intake Manifold 5.7L 6.0L
300-137 EFI Single Plane Intake for LS1 / LS2 / LS6 Cathedral Port A mid-rise, single-plane EFI intake manifold for GM LS engines with cathedral port heads (5.7L / 6.0L)....
$139.99
