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wild cam=low manifold vacuum hard brake pedal


Traveler

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as part on my rebuild on my 71 I put a 383 stroker motor in with a wild cam.  manifold vacuum runs 5-6” at ideal, which lead to a hard brake pedal.  i put a vacuum canister in and that definitely helped, once i drive it a little, but at start up i still get a hard pedal.  a mechanic told me that early camaro’s had a 9/16” booster check valve, that installing it and running a new 9/16” hose from the manifold would help, but after several phone calls to dorman, jegs, summit, napa... no one can source the part, would anyone know a part number or other fix. 

thanks john

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You can try that but it will still be the same.

I installed a vacuum pump on my 70 SS and have never looked back. No more brake issues.

Or you can get a hydroboost system. I went pump. Cheaper and kept the stock look of the engine compartment. I installed the pump under the front fender behind the washer bottle. Out of sight and so are the lines. 

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I agree with Tom. The pump is the way to go. you can also go with a smaller booster if your not looking for that stock look. i dont think a 9/16 hose will add much difference. 

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