Peace be unto all
I’m new to the Chevy Community and need help
I have a 1985 Chevy Silverado Swb 350 engine 270 comp cam
I use to be able to hear my cam lopes very clear but every since my mechanic set the distributor back to factory, I can’t hear the lopes in the cam as good.
I called him and he said to come out on the idle screw, on the carburetor so I did that and it helped some but I still don’t have that classic cam sound like it sounded before he factory set the distributor. Does anyone no why this may be happening?
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It was very likely running correctly before you messed with the idle mixture screws, even a stock cam can be made to "lope" if you retard the ignition timing and get the idle mixture out of whack!
My guess would be that it smoothed-out the idle because everything had been set correctly by the mechanic. Reset your idle mixture with a vacuum gauge pulling the highest vacuum (disconnect the vacuum advance and plug the leak)(keep lowering idle back to correct as you gain RPM with higher vacuum readings).
You don't really have a cam large enough to lope in a 350 if your duration is 270* seat to seat, but you have better low-end torque and throttle response than a cam that lopes does.