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    Valve sizes must be changed in corresponding sizes in relationship to one another. Installing any larger valve sizes requires the removal of the heater boxes and the use of a large tube competition exhaust system, such as GB 932S or larger, dependent upon engine combination and application. Running through a stock restrictive size pipe will cause overheating and you will not achieve maximum performance gain from the larger valves in the system. In fact, you likely will have a loss of low end torque and difficulty tuning the engine for smooth operation. Flat spots are often a problem due to the low air speed from the improper vacuum rate and when larger jets are installed an over rich condition occurs at a higher RPM as the pressure increases. The engine RPM will still be governed at the same point as before by the remaining restrictive part in the system. If you have the wrong size at any location it becomes the restriction, causing an out of balance of the system. It is not practical to increase the size of the intake valve if you still use the stock size exhaust.
    This reduces the intake speed greatly and decreases the signal sent to the carb as no gain is made in the exhaust to overcome this loss of air speed. Furthermore, the restriction at the exhaust of hot gasses is just what was done to smog engines that must run at higher than normal temperatures to burn the emissions. You know the ones that are famous for flat spots and too high of head temperatures. If larger exhaust valves are added then the restrictor is the exhaust pipe and heater boxes. All manufacturers of engines use a formula to determine proper combinations to provide the correct balance to achieve proper running, cooling and longevity of the engine. For more on heads GB 801-HEADS is required reading.


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