750 on a 604

[mqdirtracer57]

I currently run a Quick Fuel 750 on my 604...It seems to perform well on large fast race tracks. I mainly race at a smaller track and was curious what makes the 650 different from the 750 component wise...I have noticed that they all generally use the same base plate. I assume the main body is the only difference?

[brad hibbard]

a 750 has a venturi size of 1.375"

a 650 has a venturi size of 1.250"

in a short explanation the smaller venturi size will pull quicker at low rpm
and a large venturi size will move more air at high rpm producing more top end power

rule of thumb ----big track big carb----little track little carb

we now offer a Stealth carb with a venturi size of 1.315"
this carb is designed for a 604 crate and blends the best of both sizes!

its not on our website yet but is in stock at the same price as all of our Stealth carbs.

Brad

https://www.race-1.com