Corvette Exhaust Manifolds

2 1/2″ Cast Iron Corvette Ram Horn Exhaust Manifolds

Unfortunately, Chevy no longer makes the popular 2 1/2 Corvette Ram Horn Exhaust Manifolds.  You may be able to find original Chevy Ram Horns on sources such as E – Bay.  We use an best “imported” copy of the 2 1/2″ Ram Horn available.

Mechanically, we have never had a problem with these “imported manifolds”.  They fit the heads just fine and durability has never been an issue.

In the air flow department, without any modifications, the “imported” Corvette exhaust manifolds suck pond water.  Yes, they must be modified for any type of performance application.

Our modifications start with CNC machining the porting from the stock size of 1.300″ x 1.300, which is smaller than most cylinder head exhaust port openings, to 1.430″ x 1.430″.  After the CNC work, we finish off the manifold with a fair amount of hand porting.  Our Modified Imported Ram Horns will perform exactly like the modified original Chevrolet Ram Horns.

Modified vs. Stock Manifolds.modified port comparison
Photo comparing 2 ports. On top is the modified port opening. Bottom photo shows the stock port opening.

Left Side Manifold  162S-Limg_0176 Modified 2.5″ outlet Corvette manifold. 1 only left (drivers) side 225.00

Right Side Manifoldimg_0204 162S-R

 Modified 2.5″ outlet Corvette manifold. 1 only right (passenger) side 225.00


Gasket-Less Pipe Kit for 2 1/2″ Ram Horn Exhaust Manifolds
The best way to start building your exhaust system.

#164 Gasketless Pipe Kit

#164A Gasketless Pipe Kit
A = Floating 1/4″ thick flange
B = Metal Sealing Ring welded to Pipe Adapter

NOTE: The 2 1/2″ Ram Horn manifolds have a 2 1/2″ outlet with a 3 1/16″ bolt pattern on the outlet flange. The bolt pattern is measured from the center-to-center of the bolt holes on the outlet flange.


164A Gasket-Less Pipe Kit adapts 2 1/2″ pipes to 2 1/2″ Corvette Ram Horn Manifolds and Modified Tru-Ram Exhaust Manifolds .  Kits include: (2) #164AF gasketless adapter pipes (which fasten to the manifold), (2) #167A 2 1/2″ mandrel formed 90° pipes & mounting hardware. 160.00

164AF – 2 1/2″ Gasketless Adapter Pipe Only: Metal sealing ring is tig welded to pipe provides the sealing and the 1/4″ thick flange provides the clamping power. Each. 1 side only. $55.00.



Recent Posts