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Username Post: VACUUM        (Topic#350002)
D5ofusc 
Poster
Posts: 15
D5ofusc
Loc: Dallas TX
Reg: 03-01-18
03-08-18 10:47 AM - Post#2726884    

can anyone tell me how much vacuum pressure i should be getting at an idle?

350 small block

D


Edited by D5ofusc on 03-08-18 10:47 AM. Reason for edit: No reason given.

 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3940
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
03-09-18 07:27 AM - Post#2726977    
    In response to D5ofusc

Depends on the intended purpose of the engine. If you’re asking about bone stock, then 18-20 should be good.

Here’s a chart from a thread by one of the learned greats here at CT:
http://www.chevytalk.org/fusionbb/showtopic.php?ti...



Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
gchemist 
Senior Chevytalk Moderator
Posts: 24320
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-11-18 05:57 AM - Post#2727179    
    In response to CowboyTrukr

Engine specs make a difference. For tuning, adjust the carb for max vacuum at idle and cruise RPMs. 17 hg or above is ideal.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
D5ofusc 
Poster
Posts: 15
D5ofusc
Loc: Dallas TX
Reg: 03-01-18
03-12-18 11:28 AM - Post#2727337    
    In response to CowboyTrukr

Yea bone stock .

D


 
1983G20Van 
Super Senior Member
Posts: 3699

Loc: Bedford, Texas, USA
Reg: 11-13-02
03-12-18 11:55 AM - Post#2727340    
    In response to D5ofusc

  • D5ofusc Said:
can anyone tell me how much vacuum pressure i should be getting at an idle?

350 small block



While not a 350, my old 305 should be very comparable considering stock cam and idle speed, etc at the time. With a well tuned Q-Jet and a properly timed HEI, I was pulling 22 in/hg in park at 650 rpm. In drive at 550 rpm it was about 18-19 in/hg. With a 204/214 @ .050 RV cam and edelbrock performer RPM intake, knock 2 in/hg off those values at the same idle speeds.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 03-12-18 11:58 AM. Reason for edit: No reason given.

 
D5ofusc 
Poster
Posts: 15
D5ofusc
Loc: Dallas TX
Reg: 03-01-18
03-13-18 05:45 AM - Post#2727435    
    In response to 1983G20Van

ok thnx very much

D


 
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