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Old 12-02-2011, 11:59 PM
chevykid90's Avatar
chevykid90 chevykid90 is offline
454, what turns your crank?
 

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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.
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