67 gal with 390? Can somebody help with a degree of angle?

Somebody was looking at my motor the other day and told me that my car wasnt running at its potential. I said what are you talking about. He measured the angle of my motor and it is sitting at a 12 degree slope where the front of the motor is higher than the rear. We pulled the front spark plugs and they looked like new compared to the other ones. He said that it was because the front plugs arent getting that much fuel. Does this sound right?

If anybody has a 67 galaxie with a 390, can you measure the angle of your motor and let me know what it is at? I am being told that the motors should be from 0=3 degrees for best fuel flow.

For a carbureted engine, the carb pad has to be at level for the carb calibration to be correct. This is something to take into consideration when doing an engine swap or modifying the suspension. A wedged carb spacer can bring it back into spec. if the engine is sitting correctly.

Thanks for the info. I never paid attention to the way the motor sat when I put it in. I was just so happy that the mounts lined up I never looked back...

If I tilt the carb to level it out, will it get gas to the front then, or will gravity be fighting it making the gas run down towards the back of the motor when it hits the manifold bottom?

Originally Posted by lnmrmn

If I tilt the carb to level it out, will it get gas to the front then, or will gravity be fighting it making the gas run down towards the back of the motor when it hits the manifold bottom?

What you need to be concerned with is that the carb itself is level (at vehicle rest). The calibration of the carb is dependent (proper fuel bowl levels) to operate correctly.

I think what you are asking is fuel mixture once through the venturi(s). Depending upon intake design, all cylinders should receive the same mixture charge. Of course this charge depends entirely upon proper carb calibration.

If that didn't make sense, I will try again.

I would take the carb off and put a level on the intake 12 degrees sounds like alot, the carb should be relatively flat taking into account vehicle rake and other suspension stuff do you have the back end of your car lifted?

I don't think mine sits level either. At one time I had a wedged stock spacer under it. I just adjust the rear bowl level down low which i did partially because of gas boiling. Notice no dif in plug color either so maybe that makes the dif who knows.

Originally Posted by KULTULZ

What you need to be concerned with is that the carb itself is level (at vehicle rest). The calibration of the carb is dependent (proper fuel bowl levels) to operate correctly.

I think what you are asking is fuel mixture once through the venturi(s). Depending upon intake design, all cylinders should receive the same mixture charge. Of course this charge depends entirely upon proper carb calibration.

If that didn't make sense, I will try again.

I'll just echo this reply and say that it does not make sense that certain cylinders would get more, or less fuel because of the angle of the carb. I can't see how that is possible. An engine will normally sit higher in the front, but 12 degrees would seem excessive.

Maybe find another one with the same engine at a show or something and see what thiers looks like. I know mine doesn't sit level, i'm not so sure any of them are totally level.
I just know I have no problems with mine at an angle except when the gas was boiling and the front bowl would over fill the rear bowl. So the back is adjusted real low and the front is lower than specs call for.

Thanks for the info. The car is lifted in the back, the carb sounds and runs like it is ok, but I was concerned when we pulled them plugs and the front 2 looked cleaner than the others. I just didnt know if gravity affected the amount of fuel that way I could easier and cheaper fix it by leveling the carb with a spacer rather than shimming up the transmission to change the angle of the motor.

Give it a shot with a wedged spacer and see if it makes a difference, just never know. It might just be carb adjustment though also.