Vacuum problems with big cam. My 350/300 has a BIG cam, causing a low vacuum, the fix was replacing the power valve in my holley carb. The kit Jan 23, 2018 · C3 Tech/Performance - Big cams and low vacuum - As we all know big cams produce low that cause vacuum operated components such ad the brake booster and the headlights. Man what a difference this made, and the car runs great. 2 questions: Will installing a 3200 stall torque converter solve both of these problems or just the surge? Dec 30, 2004 · C4 Tech/Performance - How does a big cam effect vacuum - Why does a bigger cam reduce the engine vacuum?. My question is what is ysed to help the brake booster and the headlights to operate as they should. I have to keep the engine at Sep 15, 2005 · I know this can have some debate, but my 396 with a 575 lift cam ran terrible at low range and idle until I put a limiter in my PCV vacum hose which boosted my vaccum from 14 to 25 PSI at idle. Drop a big cam in your engine and you lose vacuum—and gain a rock-hard brake pedal. Jul 1, 2004 · Re: A fix for a big cam low vacuum UPDATE KEn hawkins If you've cammed up your engine, and you have that low of vacuum, there are a few things that you need to check. The engine idle speed should be at least 900, however I'd suggest raising it to 1000 rpm under the circumstances. It has a canister on it now which is worthless. dzbf oodk hwgkl wtodnu hkvjq bcm lcpwd qyhrj jvkat vqr