ZZ4 Distributor - Chevelle Tech
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post #1 of 57 (permalink) Old Nov 10th, 19, 6:09 PM Thread Starter
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Mike
 
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ZZ4 Distributor

Trying to make sure I get the correct distributor for my ZZ4. The one on the car does not have vacuum advance. Found one of these brand new from a local guy for $75. Is this what I am looking for? SUM-850001-1. Im told it needs to have a melonized gear?

https://www.summitracing.com/parts/sum-850001-1/


If this is sufficient, the vacuum line should be direct from the manifold correct? From what you all have taught me on here, timing should be set to 34-36 total with vacuum disconnected and vacuum hooked up after.

If it's not broken, let's fix it till it is.
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post #2 of 57 (permalink) Old Nov 10th, 19, 7:44 PM
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Re: ZZ4 Distributor

What does GM recommend ? I am pretty sure they show one for that engine in the GMPP catalog.
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post #3 of 57 (permalink) Old Nov 10th, 19, 8:03 PM Thread Starter
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Re: ZZ4 Distributor

Quote:
Originally Posted by BillK View Post
What does GM recommend ? I am pretty sure they show one for that engine in the GMPP catalog.

A $500 distributor that I cant afford.

If it's not broken, let's fix it till it is.
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post #4 of 57 (permalink) Old Nov 10th, 19, 8:38 PM
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Re: ZZ4 Distributor

Google GM 93440806 or GMPP HEI, neither are close to $500.

That $128 HEI is a cheap white box distributor, you might as well save a bit of extra money and buy the eBay special for $40.

Steve R
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Last edited by Steve R; Nov 10th, 19 at 8:39 PM. Reason: Z
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post #5 of 57 (permalink) Old Nov 10th, 19, 8:42 PM
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Re: ZZ4 Distributor

This is the Real Thing ZZ4 dist. I've had one of these in every car I owned.

https://www.summitracing.com/parts/ado-93440806

No idea where that $500 number came from. These have always been 175 - 200. Best deal in rodding. just install it, no fancy bazillion volt coils or multi spark modules... Nothing, just run it. If you leave it alone it'll last 20 years.
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post #6 of 57 (permalink) Old Nov 10th, 19, 9:13 PM Thread Starter
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Re: ZZ4 Distributor

Quote:
Originally Posted by Tom Mobley View Post
This is the Real Thing ZZ4 dist. I've had one of these in every car I owned.

https://www.summitracing.com/parts/ado-93440806

No idea where that $500 number came from. These have always been 175 - 200. Best deal in rodding. just install it, no fancy bazillion volt coils or multi spark modules... Nothing, just run it. If you leave it alone it'll last 20 years.


Thanks Steve and Tom for the answers. I have a hard time processing things since my stroke when I was 26. Sometimes my memory only lasts 6 seconds, sometimes its 6 hours. This greatly helps.
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If it's not broken, let's fix it till it is.
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post #7 of 57 (permalink) Old Nov 10th, 19, 10:02 PM
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Re: ZZ4 Distributor

Quote:
Originally Posted by Tom Mobley View Post
This is the Real Thing ZZ4 dist. I've had one of these in every car I owned.

https://www.summitracing.com/parts/ado-93440806

No idea where that $500 number came from. These have always been 175 - 200. Best deal in rodding. just install it, no fancy bazillion volt coils or multi spark modules... Nothing, just run it. If you leave it alone it'll last 20 years.
Just ordered the 93440806 from Amazon Warehouse. Got a smoking deal on it for $101 because the package is damaged, be here Tuesday. The Chinese knockoff will go into my trunk as an emergency spare.
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post #8 of 57 (permalink) Old Nov 11th, 19, 2:08 AM
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Re: ZZ4 Distributor

I bought a G.M. unit from Kenny Ross Chevrolet about 6-7 years ago or 41.000 miles ago. Its in my 468 Sta. Wgn. I have not looked.... at it for years, So I guess it is still in the engine?
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post #9 of 57 (permalink) Old Nov 11th, 19, 12:03 PM
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Re: ZZ4 Distributor

Yep, ours is as installed on the ZZ4 when we got it in 1997, and 22 years, 30K miles and maybe 1 set of wires and plugs later, still untouched.

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post #10 of 57 (permalink) Old Nov 11th, 19, 6:14 PM
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Re: ZZ4 Distributor

When you get that distributor, don't forget to do the mods to make it work the way it should in a ZZ4 engine, like take the 69120 vacuum advance aid stop the degrees down to 10, so it will work on full manifold vacuum, and, speed the mechanical curve up, while retaining the 375 center plate and 41 weights, reset the main shaft end play to .015 to .019 with a fiber washer under the reluctor, and shim from there.

For decades, I have offered FREE instructions on just how to fix the ZZ4 distributors, GMPP doesn't work them correctly.

If you want a set of instructions, with pictures packagte, FREE OF CHARGE emailed to you, ask for them at:

[email protected]
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post #11 of 57 (permalink) Old Nov 11th, 19, 7:43 PM
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Re: ZZ4 Distributor

If you can't find a deal like Randy did, this Accel model has a melonized gear and it's $85 :

https://www.summitracing.com/parts/acc-59130/overview/

And don't forget the advance curve kit :

https://www.summitracing.com/parts/mor-72300
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post #12 of 57 (permalink) Old Nov 11th, 19, 8:31 PM Thread Starter
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Mike
 
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Re: ZZ4 Distributor

Solid info. Thanks everyone.

If it's not broken, let's fix it till it is.
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post #13 of 57 (permalink) Old Nov 11th, 19, 11:42 PM
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Re: ZZ4 Distributor

Quote:
Originally Posted by Dave Ray View Post
When you get that distributor, don't forget to do the mods to make it work the way it should in a ZZ4 engine, like take the 69120 vacuum advance aid stop the degrees down to 10, so it will work on full manifold vacuum, and, speed the mechanical curve up, while retaining the 375 center plate and 41 weights, reset the main shaft end play to .015 to .019 with a fiber washer under the reluctor, and shim from there.

For decades, I have offered FREE instructions on just how to fix the ZZ4 distributors, GMPP doesn't work them correctly.

If you want a set of instructions, with pictures packagte, FREE OF CHARGE emailed to you, ask for them at:

[email protected]
Dave I'm gonna swap my modded vac can (per your method) over to the new distributor. Where can I find the fiber washer and shims you describe to set end play?

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post #14 of 57 (permalink) Old Nov 12th, 19, 1:44 AM
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Re: ZZ4 Distributor

Distributor shim
https://www.summitracing.com/search/...%20Shim%20Kits

Belive msd also used to sell them?

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post #15 of 57 (permalink) Old Nov 12th, 19, 5:11 PM
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Re: ZZ4 Distributor

NO, NO, NO, NO......NO, NO on the curve kit, they do not work.

The 41 weights and 375 center plate are what the ZZ4 wants, they are fine, do not change them.

Those curve kits are NOT for street use, they are designed to eliminate the vacuum advance, and add excessive INITIAL degrees for DRAG RACING ONLY, NOT FOR STREET USE. The springs are fine, but not the weights/center.

The shims in the first selection on the link are fine for the large HEI.

As far as the upper shim I use, hardware store, and take th shaft and reluctor with you. I use a very thin diameter red fiber washer that fits all the way up into the under side of the reluctor to help alleviate the excessive end play, then complete the end play setting with the steel shims on the bottom of the shaft. End play, between .015 and .019. DO NOT STACK SHIMS SO THICK THAT THE ROTOR DOES NOT SPRING BACK FREELY. This is why we still want .015 plus end play, so the "stack" doesn't lock up the mechanical advance.

There is another reason as well, in the distance the gear is set by adding the steel shims, and the fiber washer. Most large HEI have upwards of .090 end play. Setting the end play distance with shims only on the bottom of the shaft, sets the gear, and OIL PUMP DRIVE SHAFT END FURTHER DOWNWARDS into the engine, moving both closer to the oil pump drive shaft. Too much shimming downward can possibly stack the distributor shaft, intermediater shaft and oil pump gear solid, and holding the distributor body too high to let the stack be loose. In that case, you'd need the second set of shims shown on the link, to raise the distributor body up to allow no stack on the oil pump drive setting.

Now, to those that tell me I am a moron for using a fiber washer under the reluctor, UH-HUH, Yup, OK, tell me why. Well, I KNOW why, Chevy, some Cadillac and AMC, and Buick Delco-Remy distributors rotate clockwise, and THRUST UPWARDS, so, there is no tension, nor wear stack on the fiber washer under the reluctor. Olds, Pontiac, and some Cadillac rotate COUNTER CLOCK WISE, and thrust DOWNWARDS, putting rotating tension on the fiber washer.

So, hardware store, thin wall red fiber washer, .030 or so thick, then set the end play to what I said before, and always check the shaft stack when installing the distributor, to make sure the oil pump drive isn't hard stacked, either.
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