Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
02-19-2004, 03:43 PM
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Re: 70 GTO question
Get yourself a GM service manual for the GTO. It has the electrical schematics for the whole car. I just sorted out a birdsnest butcher job in our '69 el Camino and the manual was excellent. We have the manual for our '72 Lemans Sport and it is even better than the Chevy manual for details. Even the wheel codes were listed. I picked up these books at swap meets. Most GM literature vendors seem to have copies.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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#3
02-20-2004, 12:42 AM
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Re: 70 GTO question
OK...saw something in the 70 GTO assembly manual that surprised me...a vacuum operated muffler system ! What the...did this actually get produced ? it opened the baffles in the muffler to reduce backpressure..vacuum diaphrams on each muffler !! Strange set-up.
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 <span style="font-weight: bold"> (__{B}_____]]]]~~~~</span>Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
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#4
02-20-2004, 01:46 AM
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Re: 70 GTO question
Bob,
Only a few early '70 GTO's were fitted with "Vacuum Operated Exhaust" (VOE), before GM put the "kabash" to it. The system used a "tiger button", which resembled a RAM AIR pull knob. When pulled, vacuum went to a solenoid which moved a baffle inside the muffler. The baffle directed exhaust through a lower restriction area of the muffler, which also enhanced the sound. To see the neat application for real, click the link below to watch the 1970 GTO commercial titled "The Humbler", which was also pulled by GM. The VOE and the commercial were too suggestive of racing, so GM dropped them. The Humbler Rita 
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<span style="font-style: italic"><span style="color: purple"> "Live Big, Live Bold, and live GENEROUSLY. Like Peter did." ~Tom Breske RIP COPO PETE! </span> </span>
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#6
02-20-2004, 02:22 AM
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Re: 70 GTO question
I'll say, wonder what the prices would be. Ungodly amounts of cash would be able to buy it, but making it last would be another story. That would be a cool thing to find on any car. . . what years did they make that system? Was it only Pontiac, or did the rest of GM have similar systems?
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John "Hutch" Skierka
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#8
02-24-2004, 09:11 PM
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Re: 70 GTO question
[ QUOTE ]
Bob, Only a few early '70 GTO's were fitted with "Vacuum Operated Exhaust" (VOE), before GM put the "kabash" to it. The system used a "tiger button", which resembled a RAM AIR pull knob. When pulled, vacuum went to a solenoid which moved a baffle inside the muffler. The baffle directed exhaust through a lower restriction area of the muffler, which also enhanced the sound. To see the neat application for real, click the link below to watch the 1970 GTO commercial titled "The Humbler", which was also pulled by GM. The VOE and the commercial were too suggestive of racing, so GM dropped them. The Humbler Rita [/ QUOTE ] Very, VERY cool, thanks for the link! Man that thing sounded sweet!  Eric
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