Not Ranked
If you say so...
Bill's motor is the 5% I referred to earlier.. Tunnel port motors are the exception as are roots style eaton blowers. They NEED fuel like others wish they needed fuel.. Is he over carburated at 1500 cfm.. You betcha.. But the mechanical secondaries are opening up.. Is there a ferrari (or anything else) made this side of a Winston Cup car that will stay with him.. nope.
As a precaution I looked up the secondary opening specs for a SINGLE Holley 4150/60 on a big block.. With ONE CARB you need to turn 4,960 rpm to open your secondaries fully with the LIGHTEST spring .. With the standard spring you will need to turn 7,130 rpm.. Now.. With two carbs those values are increased by at least 25% for a grand total of.... 6188 rpm with the lightest spring (past redline for a 427 so) And.. Ready.. 8,912 rpm for a standard spring.. Way past sweeping up your FE from the street.. Here is Holley's carb size formula..
RPMxCID
---------- x N where N = Volumetric efficiency is .9
2 x 1728
This means IF you can turn your FE at 6,000 rpm and say the 427 is bored .030 over and is really 440 CI you NEED 764 cfm...
Good Luck..
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
Last edited by SCOBRAC; 06-10-2002 at 10:32 PM..
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