![brodix 18 degree sbc exhaust port cnc brodix 18 degree sbc exhaust port cnc](https://www.profilerperformance.com/images/219-All-American-SBC.jpg)
This is mostly due to rumors they will not run correctly on alcohol. Greg Brotherton of Brodix says, “In the past three years or so, we’ve received a lot of calls from our customers with questions on whether to run their Big Duke engines on gas or alcohol. The proof is in the pudding as to their success, but today, roughly 50-percent of bracket- and super-class racers run alcohol as their fuel of choice. Most serious engine builders, as well as camshaft and carburetor manufacturers, have spent a considerable amount of time perfecting gasoline powerplants. Nowadays that’s not as true, however it’s not that alcohol has lost some of its punch, but rather that advances in gasoline combinations have increased. It used to be that a switch from gasoline to alcohol netted you an increase in horsepower. Those choosing to run their Big Duke cylinder heads with alcohol, though, have noticed they don’t seem to run correctly, sometimes even popping or missing. Because of its ability to run more consistently from morning to night, along with its cooling capabilities, alcohol is used by a great many bracket racers. It’s the reason we have powerplants that now “average” 900-1000 horsepower.īrodix’s Big Duke version cylinder heads for big block Chevrolet engines have been extremely popular amongst “big speed” bracket racers, but some have questioned their use with alcohol as a fuel.
![brodix 18 degree sbc exhaust port cnc brodix 18 degree sbc exhaust port cnc](https://www.stevemorrisengines.com/images/managed/Brodix-BR3-1.jpg)
#Brodix 18 degree sbc exhaust port cnc pro#
A “good” head is scanned into a computer program and a CNC milling machine “duplicates” it, alleviating much of the human aspect, and in this case, allowing Pro Stock-type cylinder heads to become economical enough for even the lowest budget. The introduction of CNC (Computer Numerical Control) machines has revolutionized the manufacturing industry and allowed what took, in the past, one person weeks to produce, to now be completed in just a few hours. These Big Duke cylinder head castings are noted by the separation of the intake ports, moving them outward of one another in an effort to end up with a better flowing port.
![brodix 18 degree sbc exhaust port cnc brodix 18 degree sbc exhaust port cnc](https://www.profilerperformance.com/images/products/219-SBC-Head-Exhaust-550.png)
Today, CNC (Computer Numerical Control) machines can take a raw casting and duplicate a good flowing head in hours. The downside to it was the increased costs involved with the modifications.
![brodix 18 degree sbc exhaust port cnc brodix 18 degree sbc exhaust port cnc](https://i.ebayimg.com/images/g/e68AAOSwqARfu3KE/s-l300.png)
The experiment was a success and speeds increased while elapsed times dropped. What seems like now eons ago, Pro Stock engine builders experimented with moving intake runners within the confines of a cylinder head in an effort to straighten out the port and flow more air. Tunnel ram manifolds, planetary transmissions and four-link suspensions are just some of the things that are now standard-issue amongst weekend-warriors. Many of the ideas that have evolved in that class have actually trickled down into the sportsman ranks. And it’s probably why that category is one of the most popular amongst sportsman/bracket racers. That all changes, though, when it comes to the Pro Stock class. However, when it comes to the “trickle-down” theory and actually attempting to utilize any of their horsepower advances on your “bracket bomber”, chances are slim you’d be able to. Three-hundred miles per hour and estimates of seven to eight thousand horsepower are nothing to turn your nose up at. The fuel car classes are certainly one of the most technologically advanced in regards to making horsepower.