Low engine vacuum question:
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
I thought, that's a lot of lift for a small block. Then I read your username. So it's a big block. Tach drive needed? Or is it a big block in the 75 or newer car? https://www.ebay.com/p/Chevy-V8-Hei-...42270593&rt=nc.
Last edited by derekderek; Apr 5, 2018 at 07:13 AM.
Thread Starter
Instructor
Joined: Apr 2018
Posts: 181
Likes: 6
From: Orlando, FL
I thought, that's a lot of lift for a small block. Then I read your username. So it's a big block. Tach drive needed? Or is it a big block in the 75 or newer car? https://www.ebay.com/p/Chevy-V8-Hei-...42270593&rt=nc.
thanks for the eBay tip.
Advanced
Joined: Aug 2016
Posts: 99
Likes: 10
From: Denver CO
I switched to an HEI unit with the vac advance connected to manifold vacuum. It is not tach drive and instead of fixing the broken cable I just converted my tach to a later year electronic one so I never have to deal with a cable again.
you are lucky getting 12 in of vacuum, I am only getting 9 and my brakes become a little iffy at idle speeds sometimes. going to go hydroboost.
you are lucky getting 12 in of vacuum, I am only getting 9 and my brakes become a little iffy at idle speeds sometimes. going to go hydroboost.
