Re: carb cfm?
JD,<br /> <br />40-50 is a lot of HP to add, so much so that I would be skeptical of those numbers on a 4.6l especially given that you're still using a 2 bbl carb. Anyway, you generally need the engine size, max RPM and Volumetric Efficiency of the Engine (VE) to figure the optimal carb size for your motor. A typical VE is @ 85-90% for normal engines. Given a VE of 90% with your engine size, the following info should give you a good ball park figure for the size carb to use.<br /><br />A 750 CFM to @ 9000 RPM<br />A 650 CFM to @ 8000 RPM<br />A 600 CFM to @ 7000 RPM<br />A 450 CFM to @ 5500 RPM<br /><br />In my opinion, too much carb is worse than too little. In other words, don't buy that 750 CFM if you're only going to be running at 7000 RPM max.<br /><br />Hope this helps.
