Holley metering blocks

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Holley metering blocks

Post  JBR-3 on April 17th 2017, 7:55 pm

I have a bunch of metering blocks with stamped numbers, but I'm unsure how to ID them.

Holley has a book, p/n 36-51-7, Holley Illustrated Parts and Specs manual (about $50).

Does this book list metering block numbering, or, which list number carbs have which metering blocks ?

Also I'd like to know the various drilled passages/bleeds sizing. Does this book have this info ?

There is some commonly available Holley info, but this kind of info that I seek seems to be much
less available. You need to know this level of detail to properly tune.

How does one measure very small holes, something like a sized pin index ?

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Re: Holley metering blocks

Post  supervel45 on April 17th 2017, 9:23 pm

JBR-3 wrote:I have a bunch of metering blocks with stamped numbers, but I'm unsure how to ID them.

Holley has a book, p/n 36-51-7, Holley Illustrated Parts and Specs manual (about $50).

Does this book list metering block numbering, or, which list number carbs have which metering blocks ?

Also I'd like to know the various drilled passages/bleeds sizing. Does this book have this info ?

There is some commonly available Holley info, but this kind of info that I seek seems to be much
less available. You need to know this level of detail to properly tune.

How does one measure very small holes, something like a sized pin index ?

!. I have that book and it only goes up to 1989 when it was printed.

2. It gives the metering block numbers if you know the List Number of the Carburetor, but not all and some of the block numbers are just generic part numbers given. If you are working on older Holley's the 1975 Edition is No. 36-51 (Rev. 2) and is much cheaper used.

3. No it does not give the hole sizes in the blocks.  

4. Use a pin gauge set or buy you a set of machinist number size drill bits, they are fairly cheap on Ebay.


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Re: Holley metering blocks

Post  supervel45 on April 17th 2017, 9:30 pm

PS: The 1989 Holley Black Book as it is commonly known stops at -2 series ie 4779-2 750DP ect. The 1975 "Red Book" goes to series -1 ie. 4779-1 on DP's and It goes to a few -2 and maybe -3's if they were made in 1975 or before.

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Re: Holley metering blocks

Post  supervel45 on May 3rd 2017, 6:17 pm

http://www.ebay.com/itm/Holley-Carburetors-Guide-Modifications-by-Dave-Emanuel-/311860292761?hash=item489c526c99:g:3~wAAOSwB-1Ysxwp

I would grab this book also, it has quite a bit of info not found in many of the later books.

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Re: Holley metering blocks

Post  4604X4 on May 7th 2017, 7:33 am

I have a Holley book by Dave Emanuel (not same title Supervel45 linked to) that has about 10 pages at the back with listings of carbs and components and their specs.
If you want to post some of the p/n you have, I would be happy to look them and report back any info - if they are listed in my book.
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Re: Holley metering blocks

Post  JBR-3 on May 7th 2017, 12:16 pm

460-4x4,
Thanks, that would be great, I'll go out and get numbers in a bit.

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Re: Holley metering blocks

Post  JBR-3 on May 7th 2017, 4:28 pm

OK, four blocks are stamped 11848 on top, appear to be inked with 11845 on the bottom.
They all have idle screws and power valves.

One block has three stamped numbers on the top: L18502, 8485, and 1947.
It has idle screws and power valves.

Two are stamped 6118 and 4 on top, one block has an additional 6478 on top.
Both have no idle circuit and no PV.

Any thoughts are welcome !

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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 5:53 pm

JBR-3 wrote:OK, four blocks are stamped 11848 on top, appear to be inked with 11845 on the bottom.
They all have idle screws and power valves.

One block has three stamped numbers on the top: L18502, 8485, and 1947.
It has idle screws and power valves.

Two are stamped 6118 and 4 on top, one block has an additional 6478 on top.
Both have no idle circuit and no PV.

Any thoughts are welcome !

The L18502 is for a 1850-2 600 Vacuum Secondary. Don't know on the rest.

Do they have a flat area for the accelerator pump transfer hole or a 1/4" recess for a transfer tube?

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Re: Holley metering blocks

Post  JBR-3 on May 7th 2017, 6:00 pm

No, none of them have that separate little transfer tube.

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Re: Holley metering blocks

Post  4604X4 on May 7th 2017, 6:09 pm

My list/book has no numbers like you describe. All the carbs listed have numbers like 134-131, 134-150, 134-214, etc., for the primary and secondary metering blocks. Secondary Metering Plates have numbers like 134-49 (and stamped "49") and 134-7 (stamped "7"), etc..
Sorry, I guess I can't help.
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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 6:36 pm

Do the 11848's have a hole for ported vacuum?

The block number seems to be linked to an HP950 which does not have ported vacuum provision.


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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 6:40 pm

4604X4 wrote:My list/book has no numbers like you describe. All the carbs listed have numbers like 134-131, 134-150, 134-214, etc., for the primary and secondary metering blocks.  Secondary Metering Plates have numbers like 134-49 (and stamped "49") and 134-7 (stamped "7"), etc..
Sorry, I guess I can't help.

The only books I know of that have the actual block numbers are the Holley Illustrated Parts&Spec's Manuals and they are very limited also, and the latter one has a lot of the generic 134 numbers for blocks like the List Number 1850-2 is a 134-128 and should be inside of the ported vacuum cavity.

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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 6:59 pm

The 6478's are coming up for a 4778 no dash 700 Double pumper secondary block.

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Re: Holley metering blocks

Post  JBR-3 on May 7th 2017, 8:32 pm

No ported vaccum on the 11848's.

You know I vaguely recall something about blocks from the "new" HP950's
when I got them many moons ago.

Thanks a bunch for your efforts guys. Mixing and matching carb stuff seems
like it's an all-or-nothing deal, if you're not damn close to runnable you'll have problems.

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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 10:29 pm

Have fun with them. 80496-2 HP 950 is what it looks like. Should have a round casting mark were the ported vacuum tube goes if it is a late model non Street HP Block.

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Re: Holley metering blocks

Post  supervel45 on May 7th 2017, 10:37 pm

Check your PM's and get with Mark, he get you going.

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