The LS6 intake manifold is arguably the most sought-after factory LS casting on the market today. Unfortunately, the LS6 intake manifold is no longer offered by GM and new old stock castings are incredibly difficult to come by and can fetch incredibly high price tags.
Fortunately, there is now an aftermarket alternative! Dorman has released their OE style LS6 replacement intake manifold. This intake was designed to be a direct replacement to the factory LS6 intakes and can easily be fitted to any cathedral port LS engine application. Dorman designed their lower plenum around the FAST 78 lower intake mold and fitted a revised LS6 style upper plenum to their lower casting. The result is an affordable aftermarket solution to the LS6 intake manifold that performs well and is designed to use existing hardware. These castings are designed for use with your OE sensors, fuel rails, injectors, and throttle body. Independent dyno testing has shown this casting to perform comparably to, or within several HP of, a factory LS6 casting.
Perfect for your restomod or LS swap project, these intakes offer excellent hood clearance at less than 7 inches tall and are a great alternative to truck style intakes (pending front accessory drive clearance). Their lightweight polymer design offers excellent resilience to radiant heat soak, helping to keep your intake air temperatures low. While these perform well out of the box, they respond even better to porting and/or light casting clean-up if you’re looking for maximum horsepower. You absolutely will not find a better value for a brand new aftermarket intake casting that offers out-of-the-box fitment with OE components.
NOTE: This is not a GM casting and is an aftermarket reproduction intake manifold produced by Dorman