Anybody know what the CFM is on a Rochester 4 bl that came factory on a 250hp 327? (not a quadrajet, WCFB i think)

Somewhere in the area of 350 cfm, at least that what the Carter WCFB's were.

Anybody know what the CFM is on a Rochester 4 bl that came factory on a 250hp 327? (not a quadrajet, WCFB i think)
If it's a WCFB, it's a Carter not a Rochester.

Might be a 4G/4GC.

Yeah, it'll be small...

I think the Model 4GC was about 485 cfm.

thanks. It's a rochester, not a carter. Was hoping for around 500cfm though.

Last time I looked 485 was around 500.

The 350hp/327 Holley is 585 cfm.

A Z-28 302 engine Holley should be either a 780 or an 800 Holley, 3310- type carb.

I don't know what the cfm's of the 220hp/283 WCFB or the 300hp/327 AFB are???

pdq67

There were 2 kinds the bigger cars used one around 500 cfm and the small blocks used a smaller one that was 400 cfm at most.