Author Topic: John Z vacuum seyup  (Read 5271 times)

fireZ

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John Z vacuum seyup
« on: April 16, 2010, 02:27:53 PM »
Does anyone have a picture of John Z vacuum setup. My 302 is running alright and I was wondering about doing Johns setup on the car. Do I need to do any other changes when I do the vacuum setup John suggests
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #1 on: April 16, 2010, 03:23:09 PM »

fireZ

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Re: John Z vacuum seyup
« Reply #2 on: April 16, 2010, 07:31:07 PM »
Thanks for getting that for me
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #3 on: April 16, 2010, 07:55:46 PM »
Your welcome. If only my memory continuously operated at 100% peak efficiency.

fireZ

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Re: John Z vacuum seyup
« Reply #4 on: April 16, 2010, 08:01:56 PM »
Yes if I could remember what I use to know .Have you tried this vacuum hookup.Did it work without any other adjustments to the engine?
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #5 on: April 16, 2010, 08:47:49 PM »
If you mean from ported to full, I did as per John's advice. I only adjusted the carb afterwords for optimum vacuum. But I also changed my can to an Echlin VC-1810.

fireZ

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Re: John Z vacuum seyup
« Reply #6 on: April 17, 2010, 06:29:39 AM »
Yes I am going to the full vacuum from ported. Is the idle at the carb the only thing to readjust? Thanks again
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #7 on: April 17, 2010, 06:44:24 AM »
Pretty much, unless you want to check dwell/timing while you have your head under there.

fireZ

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Re: John Z vacuum seyup
« Reply #8 on: April 17, 2010, 02:34:32 PM »
I am having some difficulty finding the vacuum advance that John Z recommends. Any idea where they can be bought?
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #9 on: April 17, 2010, 03:19:58 PM »
GM Parts Direct.
Or:
AC-Delco #D1316A or D1312C
Niehoff DR305
Borg-Warner V329
Standard VC-177
GM #1116236
Did you read the 4 pages in the link I posted? It's in there.

fireZ

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Re: John Z vacuum seyup
« Reply #10 on: April 17, 2010, 09:52:50 PM »
Yes I did read it and checked 3 different suppliers. I did not find a store that had any of them listed in stock. I will keep looking. Thanks
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #11 on: April 18, 2010, 03:34:42 AM »
I hunted briefly: http://www.amazon.com/ACDelco-D1312C-Distributor-Vacuum-Control/dp/B000C9OKNM/ref=pd_rhf_p_t_1

I got one at GMPD but can no longer locate it on their site.

fireZ

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Re: John Z vacuum seyup
« Reply #12 on: April 18, 2010, 08:06:31 AM »
Thanks I will try and order one
1968 Z28 LA Built
LIC # RPO Z28

Mark

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Re: John Z vacuum seyup
« Reply #13 on: April 18, 2010, 09:17:55 AM »
Rockauto.com has one VC-177 left for about 3 bucks.

They also list the D1316C as being a non stock item available for 14.38.

I've got half a dozen of various Vacuum advance cans that I bought while I was searching for the best one for my car.
Mark C.
1969 Indy Pace Car
350/300HP RPO Z11

JohnZ

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Re: John Z vacuum seyup
« Reply #14 on: April 18, 2010, 09:51:59 AM »
I buy quite a few of them, and GMPartsDirect.com has them - GM #88924985, AC-Delco #D1312C. Only one company makes them (Standard), and the others re-box them; all are stamped "B28" on the bracket. They used to be boxed as the VC-1810 - starts pulling at 4" Hg., fully-deployed at 8" Hg., providing 15*-16* of advance.
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Fathom Green
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