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CID Heads - Competition Induction Designs

CID LS3 4.5 4150 Carb BA Intake Manifold 9.24" deck

CID LS3 4.5 4150 Carb BA Intake Manifold 9.24" deck

Regular price $845.00
Regular price Sale price $845.00
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CID Heads LS3 4.5 4150 Carb BA Intake Manifold.

The CID Heads LS3 4.5 4150 Carb BA intake manifold is designed for engine applications aiming to make 750+HP using LS3 cylinder heads with a single plane intake. The 4.5" intake is also suited where port openings at the cylinder head will have more than 3" CSA, allowing for the taper percentage to be kept at a desired amount. The CID Heads LS3 4.5 BA intake manifold has an overall height of 9.5" and unmatched HP producing characteristics amongst all cast single plane manifolds. 

This version features the same 4500 square carb pad opening as the 4500 version, with 4150 Holley carburetor bolt spacing, and is designed for classes that must retain 4150 bolt spacing.

*The roof of the LS3 manifold is designed to line up with the roof of a LS3 cylinder head. The port opening on the manifold is not as tall as a factory LS3 port. Testing has shown that leaving the opening on the manifold at its cast height and matching the sides works best. Enlarging the port opening height at the flange will reduce taper in the runner and can harm performance.*

Product Features

  • The CID LS3 4.5 BA intake manifold is designed for 750+ horse power street, race and marine applications.
  • Near equal length runners that are 4.5" in area at the plenum opening with enough material to increase area to 5.5" at plenum
  • Designed to fit modified GM LS3 port openings
  • Optimized "Line of Sight" runners may require port matching.
  • Intake Manifold suits a 9.24" deck block
  • Made in the USA 
  • Manifolds DO NOT come O-Ringed and require "paper" or similar style gaskets. (Not Supplied)
  • Made to order and a "Final Sale"


  • 9.24" deck height
  • 4150 Carburetor Bolt Pattern - 4500 opening. 
  • 4.5" CSA at plenum end of runner
  • 9.5" tall. Can be milled down to 9"


One CID Heads LS3 4.5 4150 Carb One Piece BA Intake Manifold. One 4150 to 4500 1/4" plate. 

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