You only want 1.7s if you want more lift out of a cam that you aren't willing to change. They're basically a bandaid. If you're designing an engine, it's best to get a cam that gives you the lift numbers you want with 1.6 ratio rockers. That will make your engine much more sturdy.
What Mach 1 and Fordgasm said are dead on.
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351W 89 Mustang GT Convertible
[This message has been edited by jimberg (edited 05-21-2001).]