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?
Yup . the potential is there for sure , the difference I have found tuning older Holleys vs New Proforms is significant
Quote from: Chryco Psycho on December 29, 2017, 04:34:33 PM
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???
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 :alan2cents:
Quote from: Chryco Psycho on December 29, 2017, 05:22:16 PM
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 :alan2cents:
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!