What cam to use in a 318

Newbomb Turk said

And they probably were lower than that. I’ve pulled several of the early hemi’s apart and I checked one. It was 6.7:1.

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I would not be surprised. Why would you want higher? If you had a Dodge D500 dump truck fully loaded with dirt and a 354 Power Giant under the hood, you sure as heck wouldn't want 10:1.