Hey guys

Im having my Z completely restored and while at the body shop we go into a rather interesting discussion about the brake boosters. I am updating the cam on my Z to a mile regrind (.450 lift 222°) and my body shop guy brought up a concern. He owns a bunch (read: dozens) of old Mopars that he's updated the cams in and in most of them updating the cam leads to the brake booster being very ineffective due to the reduced vacuum. (example: In his Roadrunner, the brakes will work just fine...the first time, but if you press and let go and press again not so much).

So question, for those who have updated their cams, did you have any issues with the brake booster afterwards?

Thank
Jan

That cam doesn't look very aggressive. Not like a typical rumpety-rump muscle car V8 cam. Probably won't cause a problem.

I've seen belt-driven vacuum pumps. You could probably add one after the fact if you find that you need it.

Looks like you can get electric also.

https://www.summitracing.com/search/part-type/vacuum-pumps-street

That duration of 222 IMO is not aggressive enough to even worry about.

14 minutes ago, Yarb said:

That duration of 222 IMO is not aggressive enough to even worry about.

That's 222° is at .050" lift if that makes any difference.

I think you are perfectly fine