Six pack metering blocks

[John Milner]

I have three Holley six pack center carbs. I noticed the metering blocks all have different part numbers. Can anyone tell me if these numbers are correct?

Carb 1 4391  metering block 2637
Carb 2 4391  metering block 6170
Carb 3 4392  metering block 6610

Thanks

[Troy]

I found one reference to 2637:
http://saacforum.com/index.php?topic=29535.0

Apparently there's an ID Guide somewhere.

Troy

[John Milner]

That's more than I was able to find on them.  Interesting, looks like they say this one is for a Ford.  Must have got changed out at some point. Hopefully it will function as it should with the six pack carb.

[Troy]

I ran across a bunch of what I'd call "mods" where people mix-n-match those things to tweak the carbs. Obviously someone out there knows all the differences. Chicago Carburetor had some good tech info when I was researching my Six Pack and double pumper carbs but I didn't see anything with the part numbers for the metering blocks.

This apparently has the numbers that came on each carb but nothing on any of the 3 you listed:
http://documents.holley.com/techlibrary_carb_numerical_listing.pdf

Last post here doesn't sound promising:
http://www.hotrodders.com/forum/holley-metering-blocks-6821.html

But it sounds like maybe calling Holley's Tech line might get you somewhere.

Troy

[John_Kunkel]

According to the Holley Illustrated Parts Manual dated 1975, both carbs use the 6170

[John Milner]

Thanks for the information everyone.  I guess the other metering blocks should work fine, I'm just restoring a six pack setup and wanted to use all of the correct part numbers.