Meter Gage
Meter Gage

help tuning a carb? my engine has a big cam in it!?
i have a 70 chevy truck, it has a 383/700r4 with a big cam! i can seem to tune the idle cuz it has a big lobe
so the meter goes up and down making it hard to find the highest point and the Gage!
how do you tune a engine that has a big cam in it?
You have to idle it up enough so the engine runs smooth. Try 1500 rpms. Make sure with your added cam, it might need to idle at a higher rpm anyway. If it's a standard carb, then set the idle screw. An additional means is to use or install a stoich meter to determine proper air-fuel ratio. But big cams will not idle smooth anyway -they tend to "lope". They also have a tendency of creating a loss of vacuum in your system, which can lower your brake performance and cause some other issues. That can be fixed with an auxiliary vacuum pump.
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