ZZ4 with hot cam install fuel pump push rod - Chevy Nova Forum
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Old 1st-September-2011, 02:23 PM   #1
wango-tango

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ZZ4 with hot cam install fuel pump push rod

I have a brand new ZZ4 short block and I have installed the GM hot cam in it. I want to use an Edelbrock mechanical fuel pump, but I'm a little confused on which fuel pump push rod to use in it. I've read that the stock GM push rod part# 3704817 will work just fine. I have also read that ARP's # 134-8701 and Moroso # 65750 are both lightened fuel pump push rods that help prevent fuel pump float above 6000 rpms will also work on this roller camshaft. Then I have also read about using a bronze tip fuel pump pushrod. Can someone help me in selecting the proper fuel pump push rod to use? I don't want to wipe out this new camshaft by using the wrong one!
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Old 1st-September-2011, 03:01 PM   #2
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If roller contains eccentric for mechanical fuel pump.

The cam shaft is designed to work with a stock fuel pump push rod.

nothing special needed.

FYI
Al
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Old 1st-September-2011, 03:33 PM   #3
wango-tango

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The Gm Hot cam has the fuel pump lobe on it. Is there any advantage with going with the ARP, or Moroso light weight ones and will they work with that camshaft?
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Old 1st-September-2011, 07:20 PM   #4
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Some blocks have the outward appearance for a mechanical pump, but were not machined/drilled for a pushrod.

I have no idea if this is a concern for the ZZ4 engines.
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Old 1st-September-2011, 08:42 PM   #5
wango-tango

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The ZZ4 short block is drilled for a fuel pump push rod. I still woul like some feed back on if anyone has used an ARP or Moroso lightened fuel pump rod either on the stock ZZ4 roller cam or the GM roller Hot Cam and what kind of results they got with as far as wear on the cam and or fuel pump push rod. Any feedback would be greatly appreciated.
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