PRI 2021: World Products Displays New CNC-Ported Iron Heads 

With the offering of the new PBM-Erson-World Products CNC-ported iron heads, racers and rodders alike can now get a budget-friendly head with CNC porting.

This airflow improvement technology is the same effort used within World’s popular aluminum heads. The CNC porting is performed by High Velocity Heads (HVH). They port the Merlin big-block heads by porting 320 cc intake runners to 340 cc, and standard 340 cc intake runners to 365 cc.

“What we’ve done is taken our four most common iron heads, two big-block and two small-block designs, and increased the out-of-box performance by about 25 to 30 percent over what you would normally see,” explains PBM’s Brad Sauls. “The Sportsman line of  small-block heads are ported to 215 cc, and the Motown SBC head receives CNC porting to a 230 cc intake runner.”

“Circle track and pulling applications jumped upon these heads,” noted Sauls. “They’re not just limited to those motorsports…off-shore marine is also a good place for these heads because saltwater can play havoc on aluminum. Today though, lots of index class and budget bracket racers are building new larger cubic-inch and high-RPM combination with these heads.”

Note the elongated lifter openings (bottom left) to give ample clearance.

As an example of flow improvement with the big-block Merlin heads, both heads support 2.300/1.880-inch valves. The 365 cc intake runner heads flow into a 128 cc chamber, while the smaller 340 cc intake runner is paired with a 123 cc combustion chamber.

The airflow numbers for the intake side posted by World Products show 403 cfm at .800-inch lift on the Merlin 340 and 428 cfm at .900-inch lift on the Merlin 365.

“The engine builders attending the PRI show are taking a keen interest in the World Product lines because we offer these heads unassembled. That means shops can customize and build these heads for their specific customer needs,” adds Sauls. “With our business-to-business effort, we have already seen reported success with these heads producing more power and already winning races.”

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About the author

Todd Silvey

Todd has been a hardcore drag racing journalist since 1987. He is constantly on both sides of the guardwall from racing photography and editorship to drag racing cars of every shape and class.
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