Inliners International Forums General Discussion Hi Performance TLowes 292 cam vacuum?

Hey guys Ive been chasing some brake/booster issues on my truck. I was wondering if anyone knows how much vacuum Tom's 292 cam should pull at the intake manifold port for the booster. Don't want to go buy a guage if I know thats no the problem. Motor is lumped, 40 over, balanced, Clifford intake, etc.etc.

Tom's 292 cam, which is what?
How much idle spark do you have?

Stan,
Which cam? I offer a few. Most of them offer decent vacuum at idle.
A vac gauge is a cheap tool.

If the cam is hot enough that idle vacuum is low (despite best ignition setting) an easy partial fix is a vacuum storage tank, simply an empty air-tight can connected between the manifold and booster with a check valve. No sizes, no adjustments, just hook it up. The can re-charges to highest vacuum available whenever the engine supplies it (cruising, trailing throttle). It allows several power-assisted low effort stops (instead of just one) in traffic. I used the Chrysler slant 6 can many times, the Summit/Jeg's is $$. I've seen them made from all sorts of containers (2 quart tomato juice) that will hold vacuum and can have 2 fittings securely attached. The bigger the better but mount it close to the manifold using the same hose size as the booster.

Sorry Tom I can't remember which cam I bought. In fact it was probably 6 years ago. If I remember corectly I think you were only offering 1 at the time for a 292. i would have to go ack and look through my paper work.
I'm not even sure my problem is low vacuum. I have a good pedal until I start the engine. Then my pedal goes sloppy. I would think if I didn't have enough vacuum my pedal would stay firm.
Oh, What is idle spark?????? do you mean timming?????

Initial spark, where the plug fires at cranking speed.

In my experience it is quite common for a vacuum booster brake system to have the pedal feel a bit soft after engine startup..that is, think, an indication the booster is working.