vac. reading & power valve
Thread Starter
Member
iTrader: (1)
Joined: Aug 2001
Posts: 303
Likes: 0
From: New york
Car: 87 IROC Z "ZZ4"
Engine: 350 "ZZ4"
Transmission: ck performance th400 3000 stall
Axle/Gears: 3:73 10 bolt
vac. reading & power valve
hey all i just took a vac. reading and if it's correct it says about 19 20 hg
just wondering if that was good?
also would that mean i should get a 9.5 power valve or 2 sizes below that 7.5? i believe the jets are 64 front and 68's in the back
thanks
just wondering if that was good?
also would that mean i should get a 9.5 power valve or 2 sizes below that 7.5? i believe the jets are 64 front and 68's in the back
thanks
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
From http://www.holley.com/HiOctn/TechSer...o/TI-222A.html :
"A stock engine, or one that is only mildly built for street use, will have high manifold vacuum at idle speeds. To determine the correct power valve the vehicle should be driven at various steady speeds and vacuum readings taken. The power valve selected should have an opening point about 2" Hg below the lowest steady speed engine vacuum observed."
Sounds like you have a stock or only mildly built for street use engine. So, you need to take more vacuum readings.
"A stock engine, or one that is only mildly built for street use, will have high manifold vacuum at idle speeds. To determine the correct power valve the vehicle should be driven at various steady speeds and vacuum readings taken. The power valve selected should have an opening point about 2" Hg below the lowest steady speed engine vacuum observed."
Sounds like you have a stock or only mildly built for street use engine. So, you need to take more vacuum readings.
Thread
Thread Starter
Forum
Replies
Last Post
backtothe80s
Suspension and Chassis
33
Sep 5, 2015 12:39 AM
mdtoren
Tech / General Engine
0
Aug 16, 2015 05:45 PM
