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I loved my old 455. After upgrading the ignition to msd with pertronix distributor mod and leaning out the 650 holley it had I got 17.3 mpg. GRANTED that was a test. I kept my foot out of it for a whole tank of gas just to see.This is in a 71 delta 88 convertable. Having torque to spare is a wonderful thing. This result was not in a stock 455. I had a 495 lift,230 @.050 duration, edelbrock intake,hedman headers,2 1/2 duals,th400 shift kit,2500 stall converter,e heads worked a bit. A nicely thought out combinatioin. So build the big block,use parts well matched,don't buy new stuff,use e bay,save money,and remember machine shops are there to suck the money from your wallett.
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