Chevrolet Cast Iron Automotive Exhaust Manifolds

"Modified" Tru-Ram Cast Iron Small Block Chevy Exhaust Manifolds

Must run cast iron exhaust manifolds in your class? Or, tired of the hassle of headers?  Our "Modified" "Tru-Ram Small Block Chevy cast iron exhaust manifolds combines the quiet, durable function of cast iron with the best performance ever available in a cast iron exhaust manifold.  

They feature CNC machined port openings that will not block the large exhaust ports on aftermarket heads. Plus, the outlet area is machined for our bullet-proof Gasket-Less Adapter Pipes.

The "Modified" Tru-Ram exhaust manfolds make 5 more horsepower than the Corvette Ram Horn manifolds listed below. 

160-TR-MOD – "Modified" Tru-Ram Exhaust Manifold - 1 only. $297.50 each 

Cast Iron "Corvette" Ram Horn Style Exhaust Manifolds

Tired of the hassle of running headers? Our 2 1/2" Corvette "Ram Horn" manifolds are the hot ticket.

modified port comparison
Above: Modified Cast Iron Corvette Exhaust Manifolds. Photo comparing 2 ports. On top is the modified port opening. Bottom photo shows the stock port opening. Left Side Corvette Manifold - 4 to 8 horsepower gain with our Modified Ram Horn Style Manifolds verse Stock Corvette manifold.     Right Side Corvette Manifold            Port openings on our Modified Manifolds are opened up to match a Fel-Pro #1404 exhaust gasket.
Part #
Price each manifold
Modified 2.5" outlet Corvette manifold. 1 only left (drivers) side
Modified 2.5" outlet Corvette manifold. 1 only right (passenger) side
Remove generator bracket on 1 Corvette exhaust manifold
Remove generator bracket on 2 Corvette manifolds

"Gasketless"  Pipe Kits for Tru-Ram and Corvette exhaust manifolds.

The best way to start building your exhaust system.

Our "Gasketless" Pipe Kits include: gasketless adapter pipes (which fasten to the manifold), two mandrel formed 90° pipes & mounting hardware.

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

NOTE: 2 1/2" outlet manifolds have a 3 1/16" bolt pattern on the outlet flange. The smaller 2" outlet manifolds have a 2 3/4" bolt pattern. The bolt pattern is measured from the center-to-center of the bolt holes on the outlet flange.

Part # Description Price


164A Pipe Kit adapts 2 1/2" pipes to 2 1/2" Corvette & Modified Tru-Ram Exhaust Manifolds. 150.00
164AX Pipe Kit adapts 2 1/2" pipes to the smaller 2" outlet Corvette manifolds. 150.00
164AF 2 1/2" Gasketless Adapter Pipe: Metal sealing ring tig welded to pipe provides the sealing and the 1/4" thick flange provides the clamping power. Each. 1 side only.
Interested in more horsepower for your race car? For details on the ultimate     2-into -1 Exhaust System click here.

Sign up now for
the Brzezinski
Email Newsletter.