The Stovebolt Site Forums The Shop Area Engine Shop 3 x 97 strombergs on a GMC 302 setup questions

I have a 302 straight six gmc motor that is completely rebuilt, but stock. I have custome mandrel bent headers, and duel exhaust. I also have a Mcgurk log intake, with three Stromberg 97's that need complete rebuilds. That is where I am at. First question, where should I go to get the best quality rebuild kits? 2. Should I rebuild all three to a stock configuration, or should they be altered? 3. If altered, what are the suggestions? 4. I have been reading about progressive linkages and setups. Is this something that I should consider? 5. If so, where can I purchase a linkage setup? Any other suggestions?

Thanks

I am not familiar with this manifold. The manifold design will determine if you can use progressive or solid linkage.

Assuming the manifold design allows for progressive linkage, much better results will be obtained by using progressive linkage on a stock 302.

Linkage will probably need to be fabricated. Give me a call during normal telephone hours, and I can describe how to do this. You might be able to purchase some generic aftermarket linkage, but custom fabrication is not a problem.

When migrating carburetors to other than original application, ALWAYS build them to stock specifications FIRST. Then you have a "baseline".

Some alteration will probably be necessary. Check with whomever supplies your kits if they can furnish jets, idle tubes, power valves, etc. of different calibration.

Jon.

Carbking,
Thanks for the info. What is your phone number, I will call you today?

To add to the post, the McGurk intake is a log intake manifold. It has three down tubes to the head. The "LOG" is a long box, with accomodations for up to 5 carbs. I have fabricated a top plate to block off two, and use the other three. I am not sure if I understand the issue with linkage and the intake? Are you referring to a clearance issue? If so, I dont think I will have this issue, as I also fabricated transition tubes from my top plate. So, I formed 2.0" round stainless tube transitioned to the oval shape to mate properly with the stromberg base plate. I also fabricated adapter plates to then tie the carb into my transition tubes. Its all polished, and is pretty slick, I might add. So, the carbs are up above the log intake by about 2", clearance should not be a problem.

The issue with a manifold and either progressive or solid linkage has to do with if the carbs feed individual groups of cylinders or if the air fuel mixture is joint.

If the manifold were arranged such that a single carburetor barrel fed a single cylinder, then solid linkage would be mandatory; does not sound like this is the case.

Clicking on a poster's user name gives access to information about the poster. One of the fields displayed is homepage.

Jon.

Hi Jon,
I called yesterday but got your voice mail. Thank you for the response. Regarding your comments on carbs feeding individual groups of cyclinders. Just so that I understand for clarity. The 302 has three intake ports on the head. There is not one carb mounted directly to one intake port etc, but rather mounted to the log manifold. The carbs are mounted on the log directly over the down tube which is connected to the head. It's a straight shot, outside of the three carbs sharing the long log intake. Do you still consider this for a progressive linkage setup?

I checked out your website, and did not find any progressive carb linkage setups. Do you offer this? If so, how much, do you have photo's etc?? Also, what is the thought on progressive carbs, and how should you approach the "setting up" of them so that they are working correctly?

Lastly, do you offer a stromberg 97 complete carb rebuild kit? I need a quote for 3??

Thanks

Steve (Formula1)
Connecticut

Steve - answered this one by email.

Jon.