This may be a dumb thought or question.

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

Excellent question sarge . A billet cam (as used on the roller cam application) won't tollerate the the hard metal drive gear on the stock distributor, so, it makes sense it might need a special composition fuel pump drive rod since it's not roller ???? Where do I get one? I'm building "this" motor currently, still working on the valve train, but I'm gettin' to the fuel pump soon. What a stroke of luck that this subject came up now  . aceinthehole2008-07-03 20:24:36

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Jimmy B.
Just can't wait to get on the road again.

 
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After doing some research on the good 'ol internet, it seems the consensus is to use a bronze tipped FP pushrod on billet roller cams.

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

How the heck does a roller tipped pushrod work in that position? What keeps it from spinning?
Sounds like a great idea, and should add a little HP with the drag removed from the cam, much the same as roller lifters. I'mma gonna have to do a little searchin myself, now...I'm curious!


Well, I went to Comp Cams' web-site, but...the pic is the exact same for all of the p-rods they list! Not much help there! Adams' Apple2008-07-04 07:29:02

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Joel Adams
C3VR Lifetime Member #56    
My Link


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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Thanks for the part #s Sarge. I had to buy the dist. drive gear for Comp. cams also, very pricey, but they make the best one....AND JOEL, if you come up with any more info on these rods, I'd sure appreciate the education. ...Thanks guys

TEAM C3VR.....   

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Jimmy B.
Just can't wait to get on the road again.

 
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So now that I installed the standard FP push rod in my ZZ4 do I have to change it to a bronze tip push rod or can I leave it as is? Will the standard push rod ruin my cam for sure and if so what is the sence of urgency to replace it? Can I drive it as is for awhile? Other guys must have used the standard rod in thier ZZ4 as no mention of using the special push rod was in the installation for the GM manual.

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carl

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Sorry Carl, I don't have any more info at the moment ( and I'm at work ).  While, I was aware of the special dist. drive gear, I never considered the fuel pump rod either. This is my first time building a roller motor. A call to the Tech. guys at Comp. Cams, Summit, or Jegs could answer that quickly.

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Jimmy B.
Just can't wait to get on the road again.

 
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I contacted the tech rep at GM engine depot where I bought the ZZ4 and he said my standard steel push rod is just fine. He did mention the hardend gear for the distributer was required if I used my existing stock distrbuter. So with that info I will use the push rod that I installed. Thanks for asking the question as you got me thinking and that I needed to check.

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carl

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And thank You Carl. I haven't bought that rod yet so I guess I'll get the less pricey bronz one, just to be on the safe side. It couldn't be that much more than the stock style.

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Jimmy B.
Just can't wait to get on the road again.

 
                             Click to see larger views!

Well if the GM tech gave a thumbs up to using a regular steel pushrod, then leave it.

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

Thanks for the info. If I get any other information to counter the use of the steel PR I will reply to this thread. Or if anyone else has any data on the ZZ4 standard cam and the use of a special alloy PR I hope they chime in. I can always replace it.

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carl

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