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What is the best cam for a big block Chevy with tunnel ram?

There are many different camshafts available for big block Chevy engines with tunnel ram manifolds, and the best choice will depend on the specific application and desired performance goals. Some popular choices include:

* Comp Cams 280H - This camshaft is designed for high-performance street and strip applications, and offers a good balance of low-end torque and high-end power. It has a duration of 280 degrees at .050" lift and a lift of .509"/.528".

* Lunati Voodoo 60203 - This camshaft is designed for high-performance street and strip applications, and offers a slightly more aggressive profile than the Comp Cams 280H. It has a duration of 284 degrees at .050" lift and a lift of .525"/.545".

* Edelbrock Performer RPM Cam Kit - This camshaft kit from Edelbrock is designed for high-performance street and strip applications, and includes a camshaft, lifters, and pushrods. It has a duration of 284 degrees at .050" lift and a lift of .510"/.530".

* Howards Cams 224/234°HR-11 - This camshaft is designed for high-performance drag racing applications, and offers a very aggressive profile. It has a duration of 224 degrees at .050" lift on the intake and 234 degrees at .050" lift on the exhaust, with a lift of .572"/.595".

It is important to note that these are just a few examples, and there are many other camshaft options available. It is always a good idea to consult with a qualified engine builder or camshaft manufacturer to select the best camshaft for your specific application.