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). It replaces the factory plastic intake with a cast-aluminum manifold and a 4150-style throttle body flange, for a broad torque curve and the best performance from 2,500 to 7,000 RPM. A good fit for LS swaps, mild turbo, centrifugal blower and nitrous builds.

• Single-plane, mid-rise design; 4.95 in. height
• 4150-style square-bore throttle body flange
• Lightweight cast aluminum, about 11.5 lb
• Operating range: 2,500–7,000 RPM
• Satin, Black or Polished; Kit options add our 534-218 fuel rail kit

Engine and Vehicle Fitment

• GM LS1 / LS2 / LS6 and other cathedral port 5.7L / 6.0L LS engines, standard deck
• 1998–2002 Camaro 5.7L
• 1997–2004 Corvette 5.7L; 2005–2007 Corvette 6.0L
• 2004–2005 Cadillac CTS-V 5.7L
• LS swaps using a cathedral port engine

Full specifications are in the Specifications tab.

What's Included

• 1 × intake manifold
• Kit options: 534-218 fuel rail kit
• Additional parts as shown in the product photos

Why Haytalras

• Built in our own factory. We cast and CNC-machine our intake manifolds in-house. The same factory has produced intake manifolds for Holley, TSP and Professional Products.
• Checked before it ships. Every manifold goes through air-tightness, dimensional and visual inspection.
• Ships from the US. Free shipping from our California and Georgia warehouses, out the door within 24 hours, usually delivered in 3–7 days.
• Backed by us. 30-day free returns and a 1-year warranty on casting defects.

Frequently Asked Questions

Which LS engines are cathedral port?

LS1, LS6, LS2 and most 4.8L / 5.3L / 6.0L truck engines (LR4, LM7, LQ4, LQ9 and others). LS3, L92 and L99 are rectangle port. See our LS intake guide.

Can I reuse my factory fuel rails and injectors?

Not the fuel rails. The 534-218 kit includes EV1 and EV6 injector mounting brackets; some aftermarket injectors may need a separate holder.

Not sure it fits?

Email haytalras@gmail.com with your vehicle, engine and cylinder head casting number and we'll confirm before you order.