upnorth

Getting ready to install new intake . I just put a new carb on last year Quick Fuel HR 680 VS. The new intake suggests 650 to 800 carb . What do I look for if its not enough carb?

MISTERZ06

........................................ .......... tom

http://www.csgnetwork.com/cfmcalc.html

http://www.ehow.com/how_7570346_calc...retor-cfm.html

http://www.hotrod.com/articles/how-b...b-do-you-need/

http://www.hotrod.com/articles/selecting-right-carb/

upnorth

Put the same numbers in each
355 at 6000
4 answers
1 616
2 770
3 524
4 said you can't use a standard formula .
At least my 680 is somewhere in the middle .

Procrastination Racing

Unless you have a wild cam and heads and a motor built to race, you will rarely need more than 650 cfm on a small block. More people over-carb than under-carb.

The way you will know is if it falls on its face before reaching top end.

sunflower 1972

I believe the stock Rochester 4 bbl carb was 750 cfm, which is a spread bore design. IMHO, what you have now should be fine.