340 has no balls

I'm running a 750 speed demon with the RPM and cast x heads. It's not too much carb. Remember the thermoquad was an 850 stock.


Actually there were two sizes of thermoquads used on production cars. The smaller one with 1 3/8" primaries is roughly 800 cfm, and the bigger one with 1 1/2" primaries is about 850 cfm. 340s and 400's had either one depending on options. All 440's had the bigger one.