OK, does anyone have a good resource for tuning the tripower carbs. Vacuum, fuel & idle. Tricks tips would be great. I know I saw something on the web, but I can't find it after searching for a couple hours.

I don't know what happended to my original thread about rebuilding a 68 hardtop convert 427/435, but I am at the final stage of getting the carbs working right & sinked up. Any help would be huge. Thanks.

 

The center carb is the heart of the system. The ends are along for the ride until the engine demands there use. Treat it as a 2 bore engine as the center has all the adjustments. Very simple to set up as long as the factory parts are still on the intake.

 

Yeah, everything is there. Just hoping someone has a manual or article on how to get them right.

 

anyone ??

 

Chassis Service manual, from Chevrolet, for your year. I was amazed at how useful this book is...I have a '69 tripower, but I also have several Cutlasses, and the Chassis Service Manual includes the Chevelle, so I'm getting tremendous value from it.

The CSM tells how to tune the tripower carbs.

Steve

 

I'll chime in here. I don't know of a manual per se, but it's pretty much basic Holley repair x 3. Most comon problem/mistake is trying to run a Holley that hasn't had gas in it for a while. Before you start worrying about tune, they need fresh gaskets and a new power valve in the center carb. Also, a tight throttle shaft is a must on the center carb. They are often worn badly due to the miss-designed return spring mount. ALWAYS add or replace the original with a second spring that pulls directly on the top where the trottle cable hooks up. This unloads the shaft as a fulcrum and it will last.

When I first hook up any multi-carb setup (and I own/work on a bunch), I'll leave the secondary carbs unhooked (but tied down in their idle position!) and concentrate on setting up/tuning the primary carb(s). It's no different than any other carb in that sense. Once I have it running and driving well, I'll add the linkage to the secondary carbs and go from there. Since the 3x2 on a vette has vaccum secondaries, it is less complcated than a full mechanical setup.

I do have the advantage of a dyne to set the carbs up, but it can be done without one fairly easily. Let me know what your working with specifically and I'll try and be of further help.

Hans

 

Do a search for TOM454. He rebuilt mine to perfection. He is really in the know on typical tuning, what to replace in rebuild kits that are available out there, and knows allot about the metering blocks

I will warn you:

1. About 100% of the tri power rebuild kits out there DO NOT have the right parts
2. Dont count on Holley Tech to help: They have lost thier historical knowledge on these carbs

 

Holley does carb restoration at a Bowling Green, Ky facility.(?) They quoted me something like $600 as a minimum charge to rebuild a set of 3X2's. (Price didn't include much in the way of new parts, but did include replating). I'd like to think that if you sent your carbs to them, they'd come back like new. I've never heard anyone comment about their work.

 

The gasket kit I got from Holley looked great. All the same size & matching hole patterns. So I think the carbs are doing well as far as the rebuild part.Having a dyno would be sweet. Maybe I'll rent some time on one for tuning.