Undercover Porting - Brzezinski Racing Products (castheads.com)
Didn't know what undercover porting was so I looked it up. Not sure if it applies to this situation but now I know what it is.
What is “UnderCover Porting”? ; ; ; Brzezinski Racing Products developed “UnderCover Porting” back in the 1980’s when racers wanted more power but needed the ports to look stock. The goal of “Undercover Porting” is to improve airflow as much as possible while keeping the ports as stock appearing as possible. To achieve this goal, we perform flow bench research and development work on each type of cylinder head.
“UnderCover Ported” heads do not have the area below the valves blended and polished. Depending on the style of head, we may do some limited work in the “Bowl Area”. We can gain air flow with more extensive porting to this area, but it isn’t worth the risk of having the port more visually modified. In essence, we only rework the areas that will improve air flow and can be effectively “covered-up”. Our SST Ported & CNC Sportsman Ported heads have these areas extensively reworked.
How much does “UnderCover Porting” help?
The heads required for many racing applications such as Vortec, Dart SS, Engine Quest 350I, Engine Quest Vortec, Double Hump and Open chamber heads were designed for street applications, or as street replacement heads, where the engine doesn’t see much over 4,000 rpm. In a typical racing application, your engine will not be running under 4,000 rpm. The difference from a stock set of heads to “UnderCover Ported” is huge, especially if the engine is running over 6,000 rpm. The stock heads were just not designed to run this type of rpm.
Over the years, we have found that “UnderCover Ported” heads consistently produce 15 to 20 more horsepower than stock heads. Sometimes this improvement is more in the 25 to 30 horsepower range, especially on heads that were designed for street use that are run on race cars.
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