Racing Fuel Systems

I just bought a 3418 Holley, 855 VS, 2 corner idle with the spivy’s on the 2 boosters

The rear 5253 metering block has the IFR drilled all the way through to the other side. There is no brass restriction in place. The 2 holes are directly inline with their IFR, almost like they drilled to far. The holes are around .026

At first I thought that Ricky racer went drill happy, but I have found 5 different 5253 secondary blocks with identical holes, I cannot find these holes in any other metering blocks.

Why are they there?

Leave them alone?

Plug them?

Can you post a picture?

Is there an air bleed in the lower main venturi ? Some of the factory OEM carbs such as list 4346 1969 780 cfm and list 4803 1971 LS6 have these.

If I could figure out how to make the pictures smaller I would send it. The holes are in the idle wells.

Any idea how to shrink down the pictures would be appreciated.

Other than these 2 holes, everything else is normal. The carb does have the angled brass tube in the right side primary that connects to the vacuum pod

Is this the carb that's on eBay?

Did you notice that there is no transfer hole from the main well beside where the IFR would normally be ? ( Idle fuel from main well passage )
The IFR IS the drilled hole from the float bowl side into the idle well.

Not the one on eBay, I got this one locally. The holes you see on float side are the same as the IFR

I see it now!! Any reason why they would have done it that way instead of the normal way ?

I am glad that I removed the plugs that I had put in.

Why on this carb?

A few performance carbs have the idle cct feed direct from the float bowl, & not via the main well. I assume it gives more accurate main cct metering.
Carbs such Comp Series TQ, Weber DCOE & IDA have this.