Author Topic: 302 chevy SB with three duces  (Read 5575 times)

camaroman1969

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302 chevy SB with three duces
« on: July 12, 2015, 01:10:27 AM »
I was looking through a Holley carb book recently and found a picture of a 302 chevy small block with three duces sitting on top of engine.  Has anyone seen something like this before???
Thanks

ZLP955

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Re: 302 chevy SB with three duces
« Reply #1 on: July 12, 2015, 11:48:50 AM »
That wouldn't be a factory setup, but I do recall reading something years ago about Smokey Yunick experimenting with a tri-power 302 SBC. Are you able to post a picture of that book image?
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william

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Re: 302 chevy SB with three duces
« Reply #2 on: July 12, 2015, 03:41:17 PM »
A factory 3 x 2 small-block set up got close to reality.

Check out page A11 in the K19 section of the 1967 Camaro Assembly Instruction Manual. Was to be the L70 option, probably for SS350. Many years ago an intake manifold for L70 was found with a '0-' casting number.
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JohnZ

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Re: 302 chevy SB with three duces
« Reply #3 on: July 13, 2015, 04:02:50 PM »
As I recall, either Edelbrock or Offenhauser made a 3x2 intake for the small-block Chevy that used Rochester 2GC carburetors; I remember seeing them on various shoebox Chevys in the late 50's.
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Mark

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Re: 302 chevy SB with three duces
« Reply #4 on: July 13, 2015, 06:54:14 PM »
Offenhauser used to sell a 6 pack carb top plate for their cross ram intake manifold, think it was made for a set of 2300 series Holley carbs.  Probably can still get it if you can find someone that sells the Offenhauser Cross Ram.
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VINCE Z28

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Re: 302 chevy SB with three duces
« Reply #5 on: July 13, 2015, 07:13:54 PM »
FYI " Almost all of Chevrolet experimental parts carried a "O" or " L" casting number" CBTN's page 161.
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Quick L30

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Re: 302 chevy SB with three duces
« Reply #6 on: January 09, 2022, 07:08:27 PM »
Hopefully this is worth the thread resurrection, here's a Hemmings article on a L70 intake that surfaced recent

https://www.hemmings.com/stories/2021/11/04/once-owned-by-smokey-yunick-this-chevrolet-small-block-intake-manifold-may-be-the-last-remnant-of-a-canceled-high-performance-camaro

Interesting stuff!
« Last Edit: January 09, 2022, 07:47:54 PM by Quick L30 »
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crossboss

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Re: 302 chevy SB with three duces
« Reply #7 on: January 09, 2022, 07:53:59 PM »
Experimental parts/engines are (and were) not uncommon among the manufactures. Heck, Chevy (and GM) had the SOHC, DOHC, small and big block variations. Lets also not forget the small block 'Canted valve/semi Hemi heads' for a potential Trans-Am option. I would assume that all of these were deemed too expensive, and not worth the performance gain VS the costs.
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Quick L30

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Re: 302 chevy SB with three duces
« Reply #8 on: January 09, 2022, 08:06:33 PM »
Great point, there were so many experimental designs put forth, but I think the L70 is unique and intriguing to us Camaro fans because it made it so close to production that it was included in the 1967 AIM. Just Imagine finding one perched atop some ol 350 in the back corner of a long abandoned speed shop.   ;D
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crossboss

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Re: 302 chevy SB with three duces
« Reply #9 on: January 09, 2022, 08:40:29 PM »
Great point, there were so many experimental designs put forth, but I think the L70 is unique and intriguing to us Camaro fans because it made it so close to production that it was included in the 1967 AIM. Just Imagine finding one perched atop some ol 350 in the back corner of a long abandoned speed shop.   ;D



My gut tells me this would have been first seen/optioned for the Corvette. Why you ask? Corvette was Chevy's heavy hitter in the performance lineup. That said, IF this intake did make production, the 'cost' could be absorbed in the higher priced 'Vette. Then eventually, it would have trickled down to other models, like Camaro. Of course, this is just my speculation.
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KevinW

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Re: 302 chevy SB with three duces
« Reply #10 on: January 10, 2022, 11:20:46 AM »
Bill Fowler (Solo Speed shop) just posted videos on facebook of a 3x2 Z/28 he is working on and got running :)

https://www.facebook.com/groups/248783903294143/user/100015937096526/


Kelley W King

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Re: 302 chevy SB with three duces
« Reply #11 on: January 10, 2022, 01:24:27 PM »
I agree with JohnZ there were 3 duce intakes for smallblocks made by Edelbrock or Offy. There was one with 2GC,s on Graigslist around here a couple years ago for less than 1K.  I thought about it but the carbs were all regular 2 barrels, but probably should have got it anyway. I think GM banned multiple carbs except the vette after the 1966 model year. Up to 66 pontiac and Olds had tripower since the 50,s. The chevy 348 also had tripower until 1961.
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crossboss

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Re: 302 chevy SB with three duces
« Reply #12 on: January 10, 2022, 06:16:53 PM »
I would think a Tri-Power/Six Pac is better on the street than a dual 4 set up. Mopar, and some Fords did pretty well with them. Especially the 435 HP Tri-Powered Corvettes that was in production up until 1969.
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maroman

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Re: 302 chevy SB with three duces
« Reply #13 on: January 10, 2022, 10:18:49 PM »
There are lots of hot rods with SBCs and 3X2s.
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Quick L30

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Re: 302 chevy SB with three duces
« Reply #14 on: January 11, 2022, 02:18:41 AM »
Bill Fowler (Solo Speed shop) just posted videos on facebook of a 3x2 Z/28 he is working on and got running :)

https://www.facebook.com/groups/248783903294143/user/100015937096526/

This is the same car from the Hemmings article. Lots of great back story on Solo's Facebook post, sounds like the intake will stay with car.
1967 RS L30 - M20
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Original 327 & K19 intact

 

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