Does the upgrade to a 390cfm holly carb improve the performance of the L-24 if everything else is stock?

I guess you haven't seen the 'Turbo Twins' video. They actually slowed the cars down with that setup. The general consesus on that setup is 'steer clear!'

The 4 barrell will be more reliable in regards to the choke and having to sync the SUs....

But the path the gas has to travel between the 4 barrell and the motor is all messed up when you compare it to the SUs.

the Su's have almost a straight path from carb to engine...the 4 barrell fuel has to go down, then sideways, and the intake has unequal lengths the fuel has to travel. Less performance.

I read somewhere that basically unless your cam is extremely high rise, the SUs are essentially as good as it gets (including the stock air filter housing)...nissan did their homework on that one.

We're talking round tops, by the way!!!!!!

Peace out, brothers

The Holley carb on a L6 is only good as a conversation piece. Stick with the round top SUs.