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Old 02-19-2004, 03:43 PM
Keith Tedford Keith Tedford is offline
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Default 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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Old 02-19-2004, 04:39 PM
Belair62 Belair62 is offline
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Default Re: 70 GTO question

Got them Keith....I hate wiring schematics !!!
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Old 02-20-2004, 12:42 AM
Belair62 Belair62 is offline
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Default 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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Old 02-20-2004, 01:46 AM
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MrsBillyBobcat MrsBillyBobcat is offline
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Default 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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Old 02-20-2004, 02:10 AM
Belair62 Belair62 is offline
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Default Re: 70 GTO question

Now that would be cool to find NOS huh !!!
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Old 02-20-2004, 02:22 AM
skierkaj skierkaj is offline
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Default 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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Old 02-20-2004, 06:18 AM
442w30 442w30 is offline
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Default Re: 70 GTO question

It was available only on the GTO in 1970, and about 250 were made. My friend has one NOS.
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Old 02-24-2004, 09:11 PM
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VintageMusclecar VintageMusclecar is offline
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Default 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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