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It all depends on what you are trying to do. And what each person considers "powerful".

To make maximum high rpm horsepower you'll need big valves, lots of compression, big cam, big carb, etc.

To make maximum low end torque you'll need to concentrate on moving the charge through the engine quickly. Smaller valves, quicker duration cam, dual plane intake...all intended to maximize velocity.

Every performance engine is a compromise between these two. Best advice is to contact the cam manufacturer of your choice to discuss your application. They can give you a recommendation for the correct cam, and will tell you what kind of airflow numbers, compression, exhaust, etc. you'll need to achieve your goal.

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Q: What size heads should you go with to make a powerful 350 sm block?
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