holley metering block ?s

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ssba

ssba

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I came across a pair of metering blocks that I don't have any info on.
Thought someone may know by looking at them who may have worked on
them or if they are a standard holley part.
They are marked primary and secondary on the top.
Pictures show #s stamped into the bottoms.
Google searched the #s and got nothing myself.
Got them in a lot purchase from a guy who knew nothing about them same
as I.
Anyone have any thoughts or care to make a guess.
They appear well done so I was thinking they may be professionally modified? But how to
determine what usage? I believe them to be from the holley HP line.
Any help would be great. Hope the pictures are clear enough to read.
 

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They have numbers stamped on them. You should be able to reference them with that.
 
Thought that myself Rob.
But I turned up nothing on google. I believe they are newer than any of my
old holley books.
I'm thinking they may have been stamped by a carb builder rather than holley.
They are loaded full of threaded brass inserts. Made me lean towards modified.
Not really sure.
 
I have an older Holley bible with tons of #'s. If their older blocks and you can tell me the #'s (I can't read stuff that blurry and small) I can look and see if their in it.
 
They have # 50332 on both blocks.
Both blocks also have # 400634 142
Other than these #s they are marked PRI & SEC on top.

I also got a second pair marked # 50332 on both blocks also.
They have #s 4006371 146 on both blocks.
PRI & SEC on top same as first set.

My best guess is the holley block # is the 50332.
The other #s may determine the combination of drilled threaded inserts
installed in the blocks for whatever their intended use may be. These inserts are the
only difference between the blocks I can see. I am not sure if these inserts
are holley installed or some aftermarket carb builder like braswell?
Of course this is a guess. The #s do appear to be stamped before the coating
was put on. And all #s have the same font. So they may be blocks someone
removed from a modern holley HP type carb.
I figured it was a long shot hut was hoping someone may have seen blocks like
this before to give a clue as to what they are from.
All of my older holley blocks don't come with the screw in inserts as these have
so they are unfamiliar to me.
 
I have an older Holley 750HP and it doesn't have that many emulsion bleeds and they are just drilled, not inserts. Just noticed the PVCR holes/inserts are lower in the PV channel like aftermarket blocks also. My HP has drilled holes in the center like std Holley's. I haven't have a Ultra HP apart so I don't know what they have but it'd surprise me if they had 6 emulsion bleeds from the factory. Just a guess but I'd say their either aftermarket or modified. I'll dig through my book and see if I can come up with those #'s. It's a big book so it may take me a while. Will get back to you tomorrow and let you know if I find them

Do you have a small set of numbered drill bits? If so you can use them to measure the size of the idle restriction holes, the power valve channel restrictions, and the emulsion holes and that'd give you an idea if their for a gas or E-85/alky carb
 
I will get the drilled sizes and post.
Thanks for the input on this.
They look like the newer HP style castings. If that helps.
 
Here's some better pictures, last ones weren't very helpful for you guys
trying to solve this. Cell phone camera is all I got.
Rob those look close, they look to have larger inserts. I put up the new picture to see if you see the same difference I do. Do they look factory or custom to you guys?
 

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Man it's tough to tell. If they are custom, it's a dang good job.
 
Here's a picture I just found looking for any info on the #s on them. Pulled this off another
site. Comparison between standard and HP blocks.
Still nothing on the #s yet. I did find this picture though. It appears my mystery blocks
have been machined also besides inserted. Possibly started out a HP block?
 

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Certainly appears that way doesn't it? I wonder what the heck they are.
 
Rob I am the kind of guy that cleans a carb and puts it back to factory
stock and tunes from their. I wouldn't know why anyone would make something
like this. Smarter than myself I guess.
 
Are those pressed in inserts or screw in? Looks like they may take an allen wrench but can't tell for certain. If they are screw in they don't look like Holley emulsion bleeds. All Holley stuff I've seen take a flat tip screwdriver
 
Yes. Allen plug screw in brass inserts. #6, 8s & possibly 10-32 next to the power valve.I believe. I noticed they were different than Holley's
ultra HP blocks like you say.
I also seen where holley sells raw or unmachined HP blocks.
I am starting to consider this is their origin.
 
Fishy68 I haven't been able to locate my # drills. I must have loaned them out
and they disappeared some time ago. I will have to order a set to get back with you
on the sizes used.
That may be the best we can do on these. I may have to get some new inserts and
drill them for a particular use? Although I wouldn't know how to choose sizes myself.
 
ssba said:
Yes. Allen plug screw in brass inserts. #6, 8s & possibly 10-32 next to the power valve.I believe. I noticed they were different than Holley's
ultra HP blocks like you say.
I also seen where holley sells raw or unmachined HP blocks.
I am starting to consider this is their origin.
Click to expand...

ssba said:
Fishy68 I haven't been able to locate my # drills. I must have loaned them out
and they disappeared some time ago. I will have to order a set to get back with you
on the sizes used.
That may be the best we can do on these. I may have to get some new inserts and
drill them for a particular use? Although I wouldn't know how to choose sizes myself.
Click to expand...

Gotcha. I looked all through my book and don't see those #'s, sorry. My book is an older publication and after looking through it good it apparently only has the very early HP blocks in it. I didn't know Holley sold them un-machined but that is a possibility.

Generally you start out with emulsion hole sizes of .026-.027 and tune from there. The PVCR size is determined by the size of the carb and jetting. The idle restrictor sizes vary from .026 on smaller carbs to .033 on larger carbs with engines that need more idle fuel. If you decide to part with them let me know. I might be interested in them
 
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