Back in the day GM and most others measured carburetor CFM at 24 inches of vacuum. That standard is pretty much lost in the sands of time today. I'm suprised Mr Visard didn't print the inches of vacuum used in the testing.
Years ago we modified an 800 CFM and tested it on Dave Bishops flow bench and if I remember correctly it flowed 980. I however do not recall at what vacuum we tested it at. But after all the work it didn't make the car faster than the 73 SD carburetor we were running. The car ran 11.20's and pulled 460 HP several times on chassis dynos.
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If it breaks. I didn't want it in the first place.
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69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN.
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