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Old 04-18-2016, 07:08 PM
1969HO455 1969HO455 is offline
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Default GM Experimental Prototype SBC 3x2 / Tripower setup

Looking for info on this setup. I have heard there were only a few of these experimental prototypes built, GM Winter's casting stamp, SBC 3x2 (Tripower) setup. Holley carbs similar to the BBC Corvettes. I've heard they were tested for Trans Am racing, and Smokey Yunick had some experience with these. Thanks for any info you guys can share.


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Old 04-18-2016, 07:34 PM
William William is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

That was to be the L70 350 option for 1967; it's shown in the 1967 Assembly Manual. Cancelled April 1966. A few '0-' manifolds are known to exist.

If Smokey Yunick had anything to do with it he didn't mention it in his book. Since Chevrolet cancelled it long before introduction day I doubt it was ever considered for the Trans-Am. It is not listed in the SCCA Homologation papers for the Z/28.
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Old 04-18-2016, 07:56 PM
novadude novadude is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

Is that for real? I never even knew GM was considering such a thing for the SBC, let alone for a '67 350.
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Old 04-18-2016, 08:01 PM
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70 copo 70 copo is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1969HO455</div><div class="ubbcode-body">Looking for info on this setup. I have heard there were only a few of these experimental prototypes built, GM Winter's casting stamp, SBC 3x2 (Tripower) setup. Holley carbs similar to the BBC Corvettes. I've heard they were tested for Trans Am racing, and Smokey Yunick had some experience with these. Thanks for any info you guys can share.



</div></div>

The on the spot recollection from Norwood was that prototypes of the L-70/Camaro were made-and striped in paint just like the Z/28 was later in production. Your assertion about a potential connection to Trans-Am at the planning level is accurate from what my research has discovered.
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Old 04-18-2016, 08:19 PM
Hawkeye Hawkeye is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

What is the history on the pictured car? Do you have any additional photos?

Thanks for sharing.

Marty
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Old 04-19-2016, 12:15 AM
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68l30 68l30 is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

I have come across &quot;A&quot; Winters marked SBC 3X2 manifold before. I was intriqued by the markings and the seller wanted a ridiculus amount of money, at the time. Was it a GM piece? Who knows, Winters is close enough to us in NEO, lots of cool stuff and stories pop up.

BIG
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Old 04-19-2016, 12:51 AM
elcamino72 elcamino72 is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

Very interested to know more about this car. A few of these were supposedly built in Norwood for testing ... did one survive? I suppose the suffix code on the engine would be helpful as would the VIN and cowl tag data of the subject car.
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Old 04-19-2016, 02:28 AM
Lynn Lynn is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

If one survived, it likely gave up its rare parts to this car. The car pictured is a 69, as is the engine, and the hood.
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Old 04-19-2016, 02:51 AM
Kurt S Kurt S is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

Trans-Am with a non-eligible displacement engine??
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Old 04-19-2016, 12:26 PM
novadude novadude is offline
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Default Re: GM Experimental Prototype SBC 3x2 / Tripower setup

Is that a 'modern' K$N filter element on that crusty old engine? Fake Patina?
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