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Old 01-10-2004, 08:56 AM
406 ss monte's Avatar
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Holley Proform carb main body help

has any of you tried these proform carb main bodies for the holley double pumper's? i was wondering if they did help make more power,& are they as good as they say they are? i'm thinking about buying one & just want the low-down before i waist any money. thanks

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Old 01-10-2004, 09:04 AM
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They work excellent and are a steal at that price. Remember there is no choke provision on those main bodies as they are not really intended for street use. Also downleg boosters tend to be more sensitive to vacuum. If you bolt your metering blocks and fuel bowls on the new body you will probably have to play with the jetting a bit.
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Old 01-10-2004, 09:24 AM
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Virtually everything I have read about the Proform main bodies has been positive. Guys are saying a definite et/mph improvement. I think I've only seen one person say they didn't get much. But he admitted to other issues effecting his performance.

I've got the Proform 750 carb and I'm confident it's going to work great. Haven't had the chance to do much road testing to speak off, but I've got the idle dialed in. Very smoothe and I picked up almost 1" of vac. I changed the stock pv (4.5) up to a 7.5 because I've got great vacuum (10" in gear). Also jetted up from 74 to 76 on the primary. Just need to have some decent weather here to get some driving in.

Proform 750 carb
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Old 01-10-2004, 10:23 AM
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I have built several carbs on the Proform body and can highly recommend it. The quality and performance gains are impressive.

It is built overseas if that is important to you and, as pointed out above, there is no provision for a choke.

By the way, the change over is very easy.
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