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I have a Carter mechanical pump in my 393.I think it is rated 6 psi/ 120 gph.Fuel line from the tank is new 3/8" but the tank pickup tube is original,I think a 5/16" one.
I attached a fuel pressure gauge to my car and realised that the pressure drops from 6.5 PSI to 5 PSI during acceleration at high revs.
I am using a 750 mechanical Demon carb, engine produces around 500 horses.
What would be an acceptable amount of pressure drop?
Is this kind of pressure drop acceptable
 
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