262 vs 267 sbc

[Dean Feiock]

Originally Posted by Billy Nees

I would do an 81 Camaro with a 267 and find someone smarter than me to deal with the Dual-jet.

So how does one work around the Dual Jet? Or should I ask how much HP can be made on a carb rated at 287 CFM?

It gets even more interesting if you convert apples to apples. Since a 2BL is flowed at 3 inches vacuum and a 4BL is flowed at 1.5 inches of vacuum, you need to multiply the 2BL CFM by roughly .707 to get a value you can directly compare to a 4BL carb.

So 287 X .707 = 203 CFM

Using a quick online CFM calculator:
267 CID, 5500 RPM, 80% VE........ would need about 350 CFM minimum