chrgdrt
Well-Known Member
Check your throttle cable adjustment and kickdown linkage, is the carb opening all the way?
First time down the track
- Thread starter 67Cuda408
- Start date
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That could be a problem, mechanical fuel pump trying to suck fuel 15 ft through a 5/16" line under G-forces trying to put it back in the tank. Use a 3/8" line, a electric pump as close to the tank as you can, and run a 10 ga wire so no voltage drop.
You may experiment with different springs in your vs carb. Some of the stiffer springs won't even allow the secondaries to open all the way. http://www.grumpysperformance.com/holleyspr1.jpg
I agree with brian6pack. When I first put my 340 in my dart with just a cam, intake, headers and carb with a mechanical pump, best it would run was 13.7@102, with 3800 stall and 4.10 rear. I tried jetting for MPH at the track but nothing would change, same et and MPH. I double checked everything, in the end I switched to a black Holley knock off pump and regulator, first run ran 12.90 @ 105 and jetting started to affect MPH. It already had 3/8 fuel line from the tank. It may not be the only thing that is off, but worth checking.
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