secondary plate to metering block converssion help - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-23-2008, 12:57 PM
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secondary plate to metering block converssion help

is it possible to bolt on the rear of a 4160 a front metering block instead of the metering plate?

I know there are kits to make this conversion but I have 2 spare primary blocks.

I guess I would have to plug the power valve passages and possibly the idle mixture circuits as well.

Am I right?

thanks

Augusto

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Old 12-23-2008, 01:22 PM
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You needn't plug anything up. If the baseplate is drilled for the vacuum source for the power valve, you can use one there also. If it is not drillled, you can drill it for use with the power valve, or you can leave it and use a power valve plug. Or, just use a power valve plug in any case. Otherwise, there is nothing else to do. You will need to use jets that are appropriate in size.

tom

Last edited by machine shop tom; 12-23-2008 at 01:56 PM.
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Old 12-23-2008, 01:44 PM
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thankx Tom,

how about the idle mixture screws?

Augusto.
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Old 12-23-2008, 02:02 PM
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Just screw them in all the way.

tom
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Old 12-23-2008, 02:50 PM
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If I remember correctly, I performed this in the past on a Holley 1850-4 (4160-style) 600cfm vac secondary. If you are doing this conversion to create a 4-corner idle system, you will need to modify the idle passage in the base plate and drill the carb body. If this is not done, the mixture screws may need to be screwed all the way in and have no real function. Pick up this book: Holley Carburetors (S-a Design) (Paperback) by Dave Emanuel (Author). This book will tell you the proper way to do it. Also once your carburetor is modified, you may or may not notice a little stumble when the secondaries kick in as their is no secondary squirter on a vacuum secondary carb. If you can't find the book I can post pics on the modification for everyone.
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Old 12-23-2008, 07:51 PM
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Quote:
Originally Posted by tubbedz
If I remember correctly, I performed this in the past on a Holley 1850-4 (4160-style) 600cfm vac secondary. If you are doing this conversion to create a 4-corner idle system, you will need to modify the idle passage in the base plate and drill the carb body. If this is not done, the mixture screws may need to be screwed all the way in and have no real function. Pick up this book: Holley Carburetors (S-a Design) (Paperback) by Dave Emanuel (Author). This book will tell you the proper way to do it. Also once your carburetor is modified, you may or may not notice a little stumble when the secondaries kick in as their is no secondary squirter on a vacuum secondary carb. If you can't find the book I can post pics on the modification for everyone.
please post the pics because it will be very hard to find the book in this lands.

thanks.

Augusto.
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Old 12-23-2008, 07:53 PM
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Quote:
Originally Posted by F-BIRD'88
You can also modify the holley secondary metering plate to accept standard screw in Holley main jets. You need a 1/4" -32 thread tap.
where should I drill and tap the plate? can you post a pic of it, sounds like a lot easier.

thanks

Augusto.
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Old 12-23-2008, 09:53 PM
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Thanks a lot man, this is a very good advise and pretty easy to do, I preffer to drill and tap so I can change the jets according to what's needed.

this sealall stuff looks quite good, I hope it is available down here I'm gonna look for it.

Merry Christmas

Have a great holiday.

Augusto.
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Old 12-24-2008, 02:12 AM
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Augusto, I hope you're not in a rush. I will post the 4-corner idle modification and pics/diagrams in a couple of days as I need to dig up the old books from storage.
Its a simple mod that converts a vac sec carb to give you two more idle screws to fiddle with. Tubbedz
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Old 12-24-2008, 12:08 PM
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I'll wait, thanks a lot,

I appreciate your concern

Augusto
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Old 12-24-2008, 06:21 PM
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it's a generic 1850, 600 cfm, vac sec.

no problem about machining the plate I have a full machine shop, the only tool I don't have and I really wish I had is a bridgeport mill, someday I'll treat myself.

Augusto.
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Old 12-24-2008, 11:10 PM
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How to 4-corner idle your Holley

Augusto, here it is, I will try to be as thorough as possible.

The following is how to modify your Holley carb so that you can have a 4-corner idle carb. This is assuming you are installing a secondary metering block with idle screws already installed. I will separate the mod into two sections. First, the throttle plate and second, the carb body.

I am in no way responsible for any errors that you or anyone have caused when this modification is done to your carburetor. I have performed this procedure many times and am not responsible if you are new, an expert, or an amateur and performed the procedure wrongly. If you do not understand, buy a Holley carburetor book. All the Holley books describe this modification.
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Old 12-24-2008, 11:16 PM
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Throttle Plate #1

You will need to block the interconnecting fuel transfer track in the throttle plate. There are two tracks. You can fill it with a fuel resistant epoxy, like JB weld or you can block the slotted track with a steel plug or shot. What this does is seperate the track into two, the primary and the secondary.
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Old 12-24-2008, 11:21 PM
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Throttle plate #2

Now you must fill the small hole below the fuel transfer slot in both secondary bores. You may or may not have these holes, if you do...fill em. It is the constant-feed idle discharge hole.
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Old 12-24-2008, 11:32 PM
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Throttle plate #3

Now comes the drilling. I forgot the bit size but these are very small hand held drill bits. You must drill this in the exact angle as the "red arrows" in the attached pictures. This drilled hole must intersect the vertical hole in the main body. Study the attached pics before you drill, as this is crucial and if done wrong, throw the plate away. Always think, measure twice, then when absolutely sure.......measure and think again, then finally take a chance and drill. If you make a mistake here, your throttle plate is rubbish.
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