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#1
06-01-2003, 06:38 PM
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DOES ANYONE KNOW HOW MUCH VACUME A 73 S.D. SHOULD PUT OUT? CURRENTLY MY S.D. IS SHOWING 11 INCHES OF VACUME WHICH SEEMS TO LOW AND I'M TRYING TO SEE HOW MUCH IT SHOULD BE BEFORE I START MESSING WITH THE ENGINE.
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#2
06-01-2003, 06:38 PM
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DOES ANYONE KNOW HOW MUCH VACUME A 73 S.D. SHOULD PUT OUT? CURRENTLY MY S.D. IS SHOWING 11 INCHES OF VACUME WHICH SEEMS TO LOW AND I'M TRYING TO SEE HOW MUCH IT SHOULD BE BEFORE I START MESSING WITH THE ENGINE.
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#3
06-02-2003, 10:33 AM
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If it's a stock SD, that's WAY too low. I would expect to see at least 15" of vacuum at idle on a stock SD455.
Hope this helps, Lloyd '72 Formula 455 - TH400, A/C, Y99 suspension, tach & gauges, AM-FM stereo, 8-track, Formula steering wheel, etc.; Lucerne Blue with Medium Blue deluxe Interior Someday I'll be restoring a '72 GTO 455HO, TH400, A/C, etc.; Sundance Orange with Parchment buckets
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Regards, "455HO" Lloyd 2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98 
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#4
06-02-2003, 04:52 PM
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#5
06-02-2003, 06:06 PM
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What Johnta1 is hinting at is that the SD heads have the valve cover bolts protruding into the intake ports.
If these are leaking (any of the bolts are loose or missing you will get low idle vacuum). A good fix is to install (epoxy) in set screws long enough to just stop short of the intake port and still allow a nut and washer to seal the valve cover/ gasket to the head. Tom V. 
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#6
06-03-2003, 06:47 AM
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#7
06-04-2003, 04:11 PM
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wow!!!...set screws, thats a great idea.
thanks tom! agree with Lloyd on this one as well.  1973 SD455 T/A 1979 S.E. T/A http://community.webshots.com/album/16587603rOyvmFCiHs
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Home of WFO Hyperformance Shaker induction. |
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#8
06-06-2003, 01:50 PM
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[QUOTE]Originally posted by Lloyd-TX:
If it's a stock SD, that's WAY too low. I would expect to see at least 15" of vacuum at idle on a stock SD455. Hope this helps, Lloyd '72 Formula 455 - TH400, A/C, Y99 suspension, tach & gauges, AM-FM stereo, 8-track, Formula steering wheel, etc.; Lucerne Blue with Medium Blue deluxe Interior Someday I'll be restoring a '72 GTO 455HO, TH400, A/C, etc.; Sundance Orange with Parchment buckets[/ HEY GUYS, i APPRECIATE EVERONES COMMENTS. wE DISCOVERED SOME INTERNAL PROBLEMS, SO I THOUGHT MAYBE IT'S BEST TO JUST TAKE IT OUT AND SEND TO jIM BUTLER AND CO, THEN WE'LL HAVE A REAL SCREAMIN CHICKEN. QUOTE] |
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