CID – BE LS3 Intake Manifold. 9.24″ Deck. 4500 EFI

The CID Heads BE 4.0 LS3 intake manifold is designed for engine applications aiming to make 600+HP using LS3 cylinder heads with a single plane intake. The CID Heads BE LS3 intake manifold has an overall height of 9.5″ and unmatched HP producing characteristics amongst all cast single plane manifolds. It features a square carb pad designed to suit a 4500 Dominator carburetor or throttle body.

*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 works best. Enlarging the port opening at the flange will reduce taper in the runner and can harm performance.*

Made in the USA and CAD modelled with extensive use of Computational Fluid Dynamics, the BE-LS7 & LS3 intake is the ultimate LS manifold for those who want the most HP from a single plane intake equipped LS7 – LS3 headed combination.

That’s not a boast, but a dyno proven reality. See the dyno graph below. During testing for the 2016 Engine Masters Competition, the School Of Automotive Machinists & Technology ran a test on their 367CI LS engine of our as cast BE LS7 intake against a CNC ported and hand finished Mast Motorsports LS7 intake from their 2014 Engine Master’s engine.

The BE 4.0 LS as cast, made 50HP more on the peak numbers and 60HP more at Peak RPM using the Same Cam and Carburetor. Most importantly though, for those who might think this is a race only large plenum intake, the BE LS 4.0 outscored the MAST intake on the averages between 4500RPM and 7200RPM by a significant amount on a 6 liter engine !!!

The engine not only won the Nitrous class, but also took home Horsepower King and Torque Monster at the competition.

The manifold features near equal length runners that are shorter than existing single plane manifolds, allowing the potential for greater RPM and HP levels. Whilst the runners are shorter to begin with, we didn’t want to make this a high HP only intake, so the cross section of the runners in its as cast form can be ordered with 4″, 4.5″ and or 5″ of area at the plenum, so as to be useable in combinations around the 650HP mark, as witnessed by the School of Automotive Machinists testing with the 4.0″ version.

The manifolds are available for STD (9.240″), mid height (9.45″), and tall deck (9.750″) blocks. The carb flange opening is for a 4500 carburetor, but can be supplied with 4150 bolt pattern if need be, and the intake is available as a carbureted intake without fuel injection bosses machined, or a fuel injected intake with either 8 or 16 injectors.

The carb flange has enough material to run a Braswell 7395 Carburetor with 2.4″ throttle bores or an Accufab 8500 throttle body without any welding.

The LS7 & LS3 manifolds are available as a single piece or 2 piece casting. The casting has an integral 2 piece flange cast into the center of the manifold.This allows us to cut any one piece LS7 or LS3 intake in 2 at any point in time providing the intake was not modified from its original state.

So you can order your BE-LS7 or LS3 as a one piece to save money in the beginning, and then down the road if you need a two piece for access to make porting easier, you can send it back and have it cut in two.

Manifold flange port opening dimensions are designed to work with ported factory LS heads and actual dimensions are pictured below.

Cross section of the runner opening in the plenum on the 4.0 as cast version is 4″ and 4.5″ for the 4.5 version. For those wishing to make 850+HP we have a 5.0″ version. There is enough material in the runners to increase the cross section of the manifold to well above 5.5″ in area at the plenum. There is also enough material between the runners in the plenum to shorten them up a full inch, for those wanting to make serious HP at elevated RPM levels.