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The only way that cam wouldn't idle rough would be if it was stuffed in 13 to 1, 557 big block. If it was in a 460 it wouldn't be streetable and in a Windsor or Cleveland small block it's a strictly race only grind that'll probably make under 5 inches of idle vacuum at the very most.
 

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The cam in my race cleveland is a solid flat tappet with 266 int, 277 exh @ .050, with a 107 LSA, and it idles at 1100 rpm. But it makes ZERO vacuum.

And yes, it is a very lumpy idle.
 

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I was gonna say.........Mine's almost exactly the same specs, (only a little higher lift), and it idles in my 418 ROUGH. Around 1100 rpm. Sounds gnarly as hell, but ROUGH!!! (and for what it's worth, I do belive my Biggs prepared 950 is set up correctly).....................
 
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