Thread: Sbc bogging at around 40 mph and above

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Treygan,
First, welcome to CHR. Glad you're here, and hope you'll stick around, post some pictures and keep us in the loop with your jeep!

You say that the 350 ran fine for a month with the new carb, but then you started losing power under load above 40mph. To me that says that your carb cannot be too far off on the jet sizes unless your plugs gave you some clue on mixture when you pulled them. Also you mention changing the fuel filter, so hopefully it's keeping junk out of the carb.

When you say that "...It starts and runs fine first thing in the morning until it gets up to normal running temp which is about 190 degrees." do you mean that it will accelerate up above 40mph while it's warming up, but once warm it starts bogging down? If it's only bogging down after it gets fully warm I'd be looking at something in the ignition/electronics breaking down with heat. What type of distributor/ignition are you running?