required manifold vacuum

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Jul 27, 2001 | 08:47 PM

QwkTrip

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Car: '89 Firebird

Engine: 7.0L

Transmission: T56

required manifold vacuum

How much manifold vacuum is needed to operate power brakes? Looking at a thumper cam but I don't know if it's too much.

Jul 27, 2001 | 10:28 PM

TransAm383

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Who cares! Run the huge cam with a vacuum reserve canister or a vacuum pump if you gotta.

Jul 28, 2001 | 12:29 AM

RB83L69

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From: Loveland, OH, US

Car: 4

Engine: 6

Transmission: 5

No such thing as too much cam.... only not enough motor.

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"So many Mustangs, so little time..."
ICON Motorsports

Jul 28, 2001 | 01:48 AM

QwkTrip

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Car: '89 Firebird

Engine: 7.0L

Transmission: T56

So does anybody REALLY know the answer?

Jul 30, 2001 | 01:06 PM

ATOMonkey

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From: Indianapolis IN

I think that 12 in Hg. is as low as you can go, but don't quote me on that.

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