CRG Discussion Forum
Camaro Research Group Discussion => General Discussion => Topic started by: camaroman1969 on July 12, 2015, 01:10:27 AM
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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
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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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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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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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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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FYI " Almost all of Chevrolet experimental parts carried a "O" or " L" casting number" CBTN's page 161.
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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!
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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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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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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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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/
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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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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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There are lots of hot rods with SBCs and 3X2s.
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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.
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My dad has a 327 with a 3 deuce setup on it, it's either a edelbrock or a weiand, Cal custom finned oil pan and valve covers. He built the engine 10 years ago for a 57 Belair Post, then ended up selling the car. It's been mothballed under the bench ever since.
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As Bill stated, almost:
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I've got a copy of that document... unbelievable information.
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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.
While not in stock forms, I have both sets up on cars in the garage right now. A all Edelbrock dual quad set up on a 350 small block in one car and a tri power set up thats an offy manifold with Rochester 2GC carbs on a small block. Street wise the tri power is hands down better. The dual quads tend to load up more often in traffic. The tri power also gets better mileage. The dual quad is only slightly better at WOT. The tri power works better on 327 and smaller small blocks I have found. Dual quads work good on the 350 thats got alot of speed parts. You need to go out and open the dual quads up more often than a tri power setup.
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.
Yes GM banned multiple carbs after 66 except the vette in terms of production line units. Most of those aftermarket tri power intakes are setup for the 2GC's, but they also made them with Stromberg carb bases as well, but you dont see it much for Chevy engines, you only see the Stromberg bases when you are dealing with 4x2 and 6x2 intakes. With those SBC intakes you would go a take the carbs off a 348 setup to use as they were already ready to go. They run really good on the 348 motors.