JEGS 513023 single four-barrel dual-plane high-rise intake manifold is designed for Chevrolet Big Block 396-502 engines. Its dual carburetor bolt pattern allows you to use a spread-bore Quadrajet style or a square-bore Holley style Carburetor. This cast aluminum unit makes the perfect intake manifold if you're looking for additional torque and horsepower over a stock four-barrel manifold.

JEGS 513021 Dual Plane Intake Manifold Features:

• Fits Big Block Chevy 396, 402, 454, 502 Engines with Oval Port Heads
• Dual Plane High-Rise design for optimum fuel distribution
• Dual Carburetor bolt pattern for spread bore and square bore carburetors
• Includes square bore plate & gasket
• (8) Intake runner bosses cast in for nitrous or fuel injector ports
• Port exit dimensions: 1.570 in. x 1.905 in.
• Estimated runner length - Shortest: 5 in.
• Estimated runner length - Longest: 7 in.
• Manifold height: (A) 4.500 in., (B) 6 in.
• Click here to determine carburetor pad height.
• 2 Front and Rear 1/2 in. NPT water outlet ports for additional cooling
• 1 Rear 3/8 NPT vacuum port
• Provisions for dual distributor hold-downs
• Accepts late model alternator, water neck, AC, and HEI
• Provision for divorced or heated choke
• Includes choke plate, gasket & mounting bolts
• Intake gasket port matching is recommended for optimum performance

Note: This intake manifold will not fit under a stock hood on Corvettes.

Additional Recommended Items (Sold Separately):

• Stock/stamped steel valve covers may require 3/16 in. (or thicker) valve cover gaskets. We recommend JEGS 555-210171 for adequate runner clearance.
• Recommended Intake Gaskets 555-210102 for applications with open heat riser and 555-210103 for applications with blocked heat riser.
• Front to Rear Coolant Fittings and Hose
  • (2) JEGS Black 90-degree 1/2 in. NPT to -8 AN Fittings - 555-110149
  • (2) JEGS Black Straight 1/2 in. NPT to 8 AN Fittings - 555-110109
  • (1) JEGS Black Pro-Flo 350 -8 AN Braided Hose, 3 ft. - 555-110920
  • (1) JEGS Black Straight -8 AN Max Flow Hose End - 555-110002
  • (1) JEGS Black 45-degree -8 AN Max Flow Swivel Hose End - 555-110012
  • (2) JEGS Black 90-degree -8 AN Max Flow Swivel Hose Ends - 555-110022
• Carburetor Fuel Inlet Lines & Fittings
• Carburetor Spacers
• Fuel Filters
• Carburetor Linkage, Choke Kits & Components