Mallory 4309 and vacuum/boost port?
Thread Starter
Joined: May 2005
Posts: 270
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From: New Waterford, Ohio
Car: '84 Z28
Engine: 406 sb
Transmission: th400
Axle/Gears: Moser M9/5:14 ratio/Billet Locker
Mallory 4309 and vacuum/boost port?
Most of the pictures I've found on here have the vacuum/boost port disconnected. Is it not worth hooking up?
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iTrader: (5)
Joined: Jan 2002
Posts: 13,622
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
boost port will raise boost for supercharged situations, otherwise just set at 4-7psi and call it a day.
Thread Starter
Joined: May 2005
Posts: 270
Likes: 0
From: New Waterford, Ohio
Car: '84 Z28
Engine: 406 sb
Transmission: th400
Axle/Gears: Moser M9/5:14 ratio/Billet Locker
If it was hooked to a manifold vacuum source wouldn't it lower fuel pressure at an idle and let more fuel return to tank. This could make your fuel pump live longer and run cooler.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 20
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
I was having problems with my fuel pressure remaining steady when I had it connected, sometimes the pressure would be 2psi, next start it would be 10psi - so I disconnected it on mine and no more problem.
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