Originally Posted by chevykid90
That's about what my Firebird got with the old carb on the 454 BBC. I rebuild a different carb of the same model, dialed in the timing, and spent hours tuning it and I now get 11 MPG's average.. And that's with a very healthy 454 pumping out probably just above 500 HP/TQ. So to me your small block only getting 5 MPG's doesn't seem right. And I am also using a 750 CFM carb, but its a Holley with vacuum secondaries.
I have had problems with this carb ever since I got it. My engine has always loaded up on gas and has never run as good as it should since I got this carb. I have heard Edelbrock carbs were just not that good. Do you think maybe selling this carb and buying a Holley would be a good idea?