TRI Power

[IH2LOSE]

So as you folks know I am working on a 62 that I will be running a Big Block in it.I had always figured I was going to run a single 4 on it.I was just offered a Tri Power setup real affourdable(3 carbs needing rebuilding,1 manifold neededing the ears re welded,No linkage or air cleaner) and I think for the cool factor it would be great.Me personally have a problem keeping one carb in tune.How is it to set up 3 of them and keep the car in top tune.

I know on one of my old racing snowmobiles with multible carbs it was alot of work to get them in sink and keep them that way.How are they on a car to set up?

 

[1995 RedVette]

Does the Tri-power for the Vettes work that thoes on the GTO's? Running on the middle 2 barrel normally then opening the two outboard carbs when you put your foot to it. Or is it a sequential linkage, opening the #1 carb then the next carb and finally the last more as throttle is applied? I believe the Mopar 6 Pack equip cars were this way.


Brett

 

[allcoupedup]

The outer carbs are vacuum operated. Never driven a car with tri-power or worked on one but I know somone that refers to Tri-Power as "God's cranky gift to induction".
THe cool factor is definately there but IMO it is not worth the hassle. Some people believe the '66 427/425 single 4 barrel setup is the best in terms of performance. If I was building a big block I'd go with the single 4 barrel but seeing that 3x2 triangular air cleaner and knowing what's underneath is definately cool.


Brian

 

[midyear]

Nothing to a 67 tripower set up once they are set up right. I have driven my yellow 400hp roadster for 10 years and 100,000 miles on one rebuild. These systems run on the canter carb and end carbs kick in off of vacuum. I have worked on a bunch and had very few problems. My black car was a PITA until I found that the carb body had a crack in it, replaced the body and they have been great for 3 years now.

Dennis

 

[OLDCHEV]

Not only the cool factor but, possible better gas mileage if you can keep from putting your foot into it all the time.

One warning, do not over cam a big block with tri-power. At a high cruise rpm (freeway) with little throttle, you do not want to burn a piston or valve from a lean condtion with a two barrel. Check the factory 400 hp cam specs and try to stay close to them.

 

[IH2LOSE]

Not only the cool factor but, possible better gas mileage if you can keep from putting your foot into it all the time.

One warning, do not over cam a big block with tri-power. At a high cruise rpm (freeway) with little throttle, you do not want to burn a piston or valve from a lean condtion with a two barrel. Check the factory 400 hp cam specs and try to stay close to them.

The motor going into the car is a LS6 performance crate motor with a solid cam in it from the earley 90'S.(just the way gm built it)

The performance of this motor is simular to 1966 L72.I will have to compare the cam to a 70'S corvette tri power because this is the set up he has to offer me.Are all of the tri power sets from a vette vacum operated.

I am not concerned with fuel economy I just want a perfect running car that has alot of torque in it

 

[OLDCHEV]

I can guarantee you that gobs of torque is not going to be an issue with your build!

Your 2002 Vette is going to kick the 62's ass in a straight line as you are not going to be able to get enough tire under it to handle the torque you are going to produce!

My memory is fading but, check out the solid lifter cam specs on a 70-71 435 HP (454)Corvette, it was a Tri-Power setup.

My wife in our 90 Vert (L-98), stock can kick my tail everytime against my 1966 Caprice with a full roller 496 (521 Dyno HP) until the DOT drag slicks heat up and get sticky. This is a 500 HP, 4500 lb. car against a 240 HP, 3300 lb. car.

Your setup will probably be 400+ HP in a 3200 lb. car without an independant rear suspension to help get the power to the ground.

I do not know where you live but, I can already smell tire smoke!

Good Luck!

 

[bossvette]

I saw in an old hot rod or rod and custom a company that retrofits old carb setups with EFI, the nostalgic look with all the benefits of EFI I believe they were called Classic Gas.

grab a couple of street rod mags and leaf thru them you will probably find them advertized.

 

[Hib Halverson]

3x2bbl Corvettes cruise on the center carb. The two end carbs are both "secondaries".

There is no doubt that "trips" look totally awesome but there's a problem with Corvette tri power and that is the intake manifold use with the later versions. It's somewhar restrictive. The only good Tri-Power intake is the 67 rec. port unit. The rest are either for oval port heads or are a restrictive low-rise design used in C3s.

3x2s on the 67 rec. port intake (427/435), if the carbs are tuned right, can be pretty awesome. The rest of the systems can be beat by a well-tuned 850 single four-barrel.

 

[67HEAVEN]

My memory is fading but, check out the solid lifter cam specs on a 70-71 435 HP (454)Corvette, it was a Tri-Power setup.

No 3x2's were ever released on 454 engines. The 3x2 ended in 1969 with the 427.

 

[maxrevs85]

Barry Grant makes a tri-power set up for the SB chevy, non Vortex. $2400,Manifold and 3 250cfm carbs, progressive linkage. Edelbrock makes one also. Funny, i was thinking about it the other day. I owned a 66 442 with tri-power back in the day. pretty quik car and had no problems .

 

[67HEAVEN]

Larry,

On the subject of 3x2's, how many know that Chevy was planning to release this?

Look closely gentlemen.....check the carline series.....top right above.

This is what they were planned for. That's right -- both a L-68 and a L-71 full-size 1967 SS427 Chevrolet. And, no, the SS427 was NOT a Super Sport. But, that's another story, for another thread.

Don't miss the "factory" hood. :eek That hood was never on a Super Sport from the factory.....only on the SS427.

 

[ZRGator]

Knowledge is a beautiful thing. Thanks, Heaven, I didn't know that!

 

[IH2LOSE]

No 3x2's were ever released on 454 engines. The 3x2 ended in 1969 with the 427.

All right so I am slightley confused.The intake manifold of my 1966 L72 bolts right up to the LS6 454 that I plan on putting in the 62.The intake gaskets are the same for both motors.

The tri power set up is definatly off of a C3 As long as the intake gaskets mates up to the tri power manifold that means the head ports are the same and I can use it.

I am probably going to purchase this intake set up and put it on the shelf for now.I have to becarefull getting side tracked with this project ( I lost alot of time with the media blaster but it was definatley worth the troubles)I dont want to throw it too far off schedule.

I also just found out the pricing for a air cleaner set up and the carb rebuilds.

You know after looking at that photo of the impala I am luckey I have no more garage space because that is another car i would like to have (with a 427 & 4 speed and a bench seat)

 

[Viet Nam Vett]

Just Drop I a 502 and join the Club and be done with it....:L

 

[midyear]

Hey Larry,

Heres a pic of a 502 w/a 400hp tripower set up I did a few years back in a 67. looked and ran great!

 

[IH2LOSE]

Thanks guys

The fellow is going to drop off the intake next week and have a look at the SR111 frame in my garage.

It will definatley look cool in the engine bay of a 62 I just have to see how it effects the hood clearence.

 

[youwish2bme]

I want one.... Dave..