Quote:
Originally Posted by ta man
So the classic 80496 950hp is 770cfm? Tom in your opinion why is this carb out of the box with minor tweaks so responsive and crisp compared to a 4779 or a 4780. Is it the 850 baseplate in combination with the metering blocks..who ever designed it at Holley knew what they were doing.
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Good Question!
Let's see why this carb 80496 is better vs the old #4779 or #4780 carbs.
1) Every classic 80496 Holley carb is wet flow tested on a Wet Flow Stand whereas the #4779 and #4780 carbs were spot checked occasionally and compared to a "Master Carb" on Holley's Wet Flow Stand.
2) The 80496 carb has far more adjustment ability out of the box vs the other two carbs.
3) The carbs are specifically designed for Racing applications:
Bigger Cams, Better Heads, Better Exhaust Systems, Higher Compression Ratios, and they have a nice chart telling you where the carb will be most happy vs Engine dosplacement and Engine RPM.
That pretty much covers it all. My 770 cfm number is based on 20.4 " of water test pressure. Would be interesting to know what the actual Flow Stand Test Pressure is when Holley flows each carb.
Tom V.