Quote:
Originally Posted by targa72e
When using a common plenum with a single throttle body you are limited to cams with small overlap. When there is large cam overlap and a common plenum the air/fuel mixture will be blown back into the intake at idle and low speeds making for a poor running car. Because ITB's and carbs have a throttle plate over each cylinder that is closed at idle they keep the aif/fuel mixture from being blown back up the intake. This allows you to have a more aggressive cams and still have a car that will idle and run well at low rpms. So cam choice can dictate what type of intake you use.
john
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Fantastic and really great explanation for me! Thank you!