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zz4 350 - Distributor questions



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Old 05-21-2014, 04:01 PM   #1
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zz4 350 - Distributor questions

I have a zz4 crate motor. I have some what an answer to this question because i am selling the current setup on it. I was almost positive because of help during my for sale post that I mech advance HEI distributor would work for this engine with a carb set up. These motors are suppose to be turn key so that means a 3 wire hook up and no computer controlled anything for the motor ie carb which is has no smarts all mech.

with that being said when I look up the replacement part number from the specs and manual online for a zz4 and find it on summit this is what it brings up
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Davis Unified Ignition GM Computer-Controlled Distributors 12720-ZZ4

Distributor, HEI, ZZ4 Crate Engine, Mechanical/Vacuum Advance, Black Cap, Chevy, Small Block, Each

Computer-Controlled Compatible:Yes

Notesesigned for GM ZZ4 crate engine, features special timing curve and melonized gear. With L-clamp distributor cap.

If you have a computer-controlled engine, GM computer-controlled D.U.I. distributors from Performance Distributors are the replacements that you need. These distributors are built with all-new parts to ensure durability and performance. GM computer-controlled D.U.I. distributors feature brass terminal caps and rotors for maximum conductivity, nylon rotor hold-down screws to prevent high-rpm misfires, and oil-impregnated brass bushings for long-lasting life. These one-piece versions utilize a Dyna-Module and a high performance coil for excellent spark and firepower. GM computer-controlled D.U.I. distributors are also shimmed for proper endplay clearance to ensure maximum magnetic pick-up coil inductance. These units are easy to install, plugging directly into your factory wiring, and are polished for a high-tech appearance. Replace your existing distributor with one of these GM computer-controlled D.U.I. distributors from Performance Distributors. You'll be happy that you did.
---------

With all that being said I am going to ask this question 1 more time just to make sure can I use a non computer controlled HEI Distributor and call it a day or is all this special designed for zz4 bullshit what I have to buy.

I does not make sense to me why u buy a zz4 that is turn key no computer blah blah all to hook it up to a computer? Unless this is a performance add on and a way to make you spend extra money and buy a computer for your zz4 ignition system. can anybody make sense of this I want to just put the distributor out of my 78 350 into the crate motor mainly cause I dont want to pay the 300 bucks on this summit one and 2 cause I thought I was trying to stay away with computers with this motor


any help explaining this would be amazing...
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Old 05-22-2014, 06:21 AM   #2
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Yes, you can run a standard HEI, with one exception. You have to run a melonizes gear because of the roller cam. I don't recall when GM started with the different gear, but the fuzzy brain cells say it's been around since before the zz4.
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Old 05-28-2014, 12:53 PM   #3
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Quote:
Originally Posted by Bunker Buster View Post
Yes, you can run a standard HEI, with one exception. You have to run a melonizes gear because of the roller cam. I don't recall when GM started with the different gear, but the fuzzy brain cells say it's been around since before the zz4.
So that means that the melonized gear should be on the dist I have now I just need to research when they started using this gear in other words? Not sure if I fully understood your answer sorry.
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Old 05-29-2014, 09:52 AM   #4
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The distributor that came with the engine will have a melonized gear.
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Old 06-10-2014, 10:43 AM   #5
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Quote:
Originally Posted by Bunker Buster View Post
The distributor that came with the engine will have a melonized gear.
Alrighty sounds good, It will be going in this weekend I appreciate yours and every ones help!
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Old 07-31-2014, 10:16 AM   #6
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Ok another question regarding the ZZ4, I know this thing is just a cast iron 350 block with l98 heads basically I have a problem on my hands....I lost the power steering pump bracket and cant seem to find another factory bracket online I need to know what brackets will work and if anybody just knows of a bracket and year model pump ill just buy both since mine has miles on it and prolly should be replaced. Here is the problem after doing alot of research online I have come to the conclusion that many people have ad lots of trouble bolting stock power steering pumps to the zz4 cause of timing chain cover issues and Long vs short water pumps and whether the pump has a threaded or not threaded bolt hole. does anybody on here know anything about this?? Im to the point now that I need to buy a bracket in order to get my truck on the road and dont have any direction to go
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Old 08-01-2014, 07:37 AM   #7
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Borgeson Universal Company :: Pumps, Brkts & Hoses :: Self Contained Power Steering Pumps & Brackets :: Pump Bracket, Steel, SBC/LWP

OR THIS ONE PART NUMBER 402 L

Small Block Long Pump

Seems to me this will eliminate completely the bracket that mounts to the head and exhaust manifold because that is the bracket I lost and will not work with headers anyways...
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Old 08-01-2014, 05:16 PM   #8
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on my zz4 i used stock 86 k5 pump bracket. not sure if you are serpetine setup . but just get 1 at a pick n pull
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