Carburetor Main Body

[cudabob496]

Proform sells a main body in Summit for an 850 Holley,
and says a person could gain up to 50 hp???
I cut the choke tower off of my 850 DP 15 yrs ago.
Could this new main body make much difference?

[Chryco Psycho]

Yup . the potential is there for sure , the difference I have found tuning older Holleys vs New Proforms is significant

[cudabob496]

Yup . the potential is there for sure , the difference I have found tuning older Holleys vs New Proforms is significant

so its mainly just a little more smoother flow???

[Chryco Psycho]

No it is not so much about total airflow
I doubt you would gain 50 HP but you never know  , but there is a lot more to it than just flow , they seem to be far more responsive similar to EFI so the ability to get fuel into the air flow + atomization is far better so this could be better venturi shape & booster design . How much is attributed to the main body vs metering plates etc is hard to say  , I have only bought complete carbs . My bet is you would feel the difference though 

[cudabob496]

No it is not so much about total airflow
I doubt you would gain 50 HP but you never know  , but there is a lot more to it than just flow , they seem to be far more responsive similar to EFI so the ability to get fuel into the air flow + atomization is far better so this could be better venturi shape & booster design . How much is attributed to the main body vs metering plates etc is hard to say  , I have only bought complete carbs . My bet is you would feel the difference though 

ya, metering plates are new, but they are for an 850 that is almost 20 years old.
Tempting for $179. Gotta make sure my throttle plate has 1.75 inch openings. thanks!