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it's a 350 small block with approx 10.3:1 compression ratio

I want a cam with good midrange power and a mean sounding idle, yet i don't want any vaccum issues because i have power brakes, this is going to be a street vehicle.

It has to be under 500 lift because that's what my springs are rated for
 

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Elgin 1785p is about the best match for your goals with crappy .500" springs. Even with recurved timing your vacuum at idle will be low though. You'll need a vacuum canister.
 

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More machine than man
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it's a 350 small block with approx 10.3:1 compression ratio

I want a cam with good midrange power and a mean sounding idle, yet i don't want any vaccum issues because i have power brakes, this is going to be a street vehicle.

It has to be under 500 lift because that's what my springs are rated for
How can you have selected your springs before buying a cam? Step 1, get a cam, step 2 follow cam makers spring recommendation to match cam.

And roller? Retro-roller? Flat tappet? Solid? Hydraulic?
 

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I would run a 224 ish duration solid flat tappet cam with 480 lift.It would be a nice idle at 850 rpm.choosing a lobe displacement angle is just as important as duration and lift. sounding nive Vs going well? I choose the power.Lots of people do not like adjusting valves,I think its a fair trade off for the performance you get.
 
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