[gregkelley]

I just bought a 5.0 and it has been converted to a carb and if I punch the throttle down it hesitates and then takes off the carb is set how it came stock and is brand new not many miles can anyone help here is what I have on the motor. 650 Holly carb ,eldebrock victor jr intake, msd distributor, after market plug wires, and a cam not sure what kind but know it is not stock and the motor is gear driven. As far as I know everything else is stock. Please help it is driving me crazy.

[saleenxxx]

Two things migh be totally wrong. One is that a 650 cfm is a little too big if you do not have relatively the need for that much fuel into the engine. Another is a weak fuel pump. I recommend a holley high performance pump to accompany anything on a carb greater than 60cfm. Make sure that in the carb conversion they installed a high performance pump, ususally people leave this step aside and you end up having a thirsty carb without any fuel pressure. Pressure test the fuel system, I am almost positive that the adequate fuel pressure should be between 85-100lbs.

One thing never to leave out is the most common f_ _ _ ups and that is the basicsand obvious. Check timming, check to see if there is a return line from the carb that is damaged or cancelled. Depending on fuel pumps (mechanical or electric) these returns serve a purpose and most people bypass them.

[zero]

that 650 is not too big. check your timing. if thats the only time it does that, check your timing and the vaccum advance coming from the carb.

[1slo5.0]

Float levels, accelerator pump adjustment, fuel pressure and timing are the areas you need to be looking at.

[JBIGBOOTSY]

sounds like its loading up, try leaning out the Idle. Fuel pressure should be 7psi. Thats a really big carb and intake for stock heads too.