Do I need to switch my intake manifold when going from 2 bbl to 4

[Sledge]

I have a 69 f100 with a 390 FE. Running a 2 bbl carb now. I've purchased a new Holley 4 b carb 600 cf. I was told the manifold would work with either setup. Is this true? Or do I have to buy a new manifold? Also, they sell conversion mounts. Would that be the way o go?
Thanks

 

[DNFXDLI]

There are adaptors but they kind of defeat the purpose. I would look for a new or used intake.

 

[Sledge]

Thx. I was told it would mount right on without a new manifold. Is that true at all ?

 

[DNFXDLI]

Thx. I was told it would mount right on without a new manifold. Is that true at all ?

I can't see how....the boreholes wouldn't line up.

 

[kiwi f150]

Duncan is right Sledge - have a squiz at this setup off ebay and see the gasket sitting on top of the manifold.
http://www.ebay.com/itm/Ford-FE-360...Parts_Accessories&hash=item2578aca032&vxp=mtr

 

[Fellro]

The holes and studs do not line up at all, and the bore holes are way too small.

 

[Sledge]

Thanks guys. Went with a Holley 500 and didn't have to play around with the manifold. Woke her righ up!!

 

[DNFXDLI]

That's a big 2 bbl!!...I'll bet it did wake it right up!

 

[Beach66Bum]

Did you adjust the air/fuel mixture? Did you install a new fuel filter?

 

[Fellro]

That is a common stock car carb... Local tracks limit to 2 bbl so the Holley 500's get used...

 

[5.0Flareside]

but on a DD truck???

woo... talk about possibly drowning it!!!

 

[DNFXDLI]

For a 390?...I'd say it's on the mark...a small 4bbl might do better with mpg's but those 500 2bbls were as Roger said, a factory size.

 

[Fellro]

How will a 500 CFM drown a motor that can handle a 625 CFM 4bbl? Most small blocks can handle 600 CFM built mild. The stock cars are hobby stock that I refer, which typically are not that tweaked for the classes here, not on modifieds or the higher class, but the bombers.