Question about 409 intake

[feeder82]

I have this 409 intake # 3814881 its a factory manifold but the carb mounting inlet looks to have been machined out. This manifold should have 3 holes 2 small inlets and 1 larger correct? So thats my question did this thing get cut out for different style carbs or something. thanks for the help!

 

[Richard/SIA]

I've seen one like that, seller claimed it as a supercharger manifold!

I've seen one like that, seller claimed it was a supercharger manifold!
And wanted about $600 for it.

Wrecking yards do get some funny ideas of value.

Still looks like a stock manifold cut up by some one trying to go faster to me.

 

[Skip FIx]

Chevy cut down the plenums in dual planes for SBC and even the ZL-1 comapred to the L-88 intakes, just not that much.

It can reduce bottom end but helps on the top end as both banks can see both sides of the carb.

 

[feeder82]

Thanks guys, it had a couple of edelbrock carbs on it and seemed to work fine. I thought it had just been cut down.

 

[MRHP]

I had me one of those. Should boost upper rpm power. It looks like a good job.

 

[Skip FIx]

I've seen some spacers that have a slot for a divider to split the plenum like a dual plane for single plane intakes. Could use one of those if the bottom end is lacking.