Thread: Sbc bogging at around 40 mph and above

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Sorry guys. I worked last night so I just woke up. So to try to answer your questions. Up to this point it has ran fine until I get up to 190 degrees. I can drive 75 mph no problem. And I changed the fuel filter the day I changed the carb which was about a month ago. I was looking at it at a little bit though and found that the spacer for the air cleaner, which had been painted orange at some point, had some paint peeling and bubbling on the inside of it. So I know it could have easily come off and gone right into the carb. As for the ignition it's just the old style distributor. And the plugs when I changed them didn't look bad to me. They had a tan color to them, some worse than others. I hope I did ok answering. I'm not a great mechanic and probably not even a good one. I am taking the carb with me tonight to work and my boss who has do e it before is going to help me open up the carb and take a look. Thanks guys for the help and the welcome. And I'll post pics as soon as I get some extra time. Thanks again and keep it comin.

Originally Posted by Treygan

Sorry guys. I worked last night so I just woke up. So to try to answer your questions. Up to this point it has ran fine until I get up to 190 degrees. I can drive 75 mph no problem. And I changed the fuel filter the day I changed the carb which was about a month ago. I was looking at it at a little bit though and found that the spacer for the air cleaner, which had been painted orange at some point, had some paint peeling and bubbling on the inside of it. So I know it could have easily come off and gone right into the carb. As for the ignition it's just the old style distributor. And the plugs when I changed them didn't look bad to me. They had a tan color to them, some worse than others. I hope I did ok answering. I'm not a great mechanic and probably not even a good one. I am taking the carb with me tonight to work and my boss who has do e it before is going to help me open up the carb and take a look. Thanks guys for the help and the welcome. And I'll post pics as soon as I get some extra time. Thanks again and keep it comin.

The passages that you'd plug on the carb are on the fuel (liquid) side, not the air going through the venturi, IMO. You say "...old style distributor." Is it an HEI type like this with the coil on top?

HEI.jpg

Your plugs being "tan color" is ideal. Says your mixture is good. I'm thinking you've got an ignition module breaking down when it heats up. Just need to know exactly what kind of distributor/ignition you have.