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Old 01-24-2013, 04:14 PM
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putting a vacuum advance distributor on a 4.9 Caddy v8

I am doing a build with a Caddy 4.9

This will be a carb'd engine and I will be using a distributor from the older 4.5 version of the engine and no ECM.

I am told I need to use this distributor with the internal mechanism from an older engine to get a free standing weights/vacuum advance. It may be the 4.1 distributor from 1983, but I am not sure and I am looking for advice before I buy.

Does anybody know which older distributor is the proper donor for this modification?

Thanks,

and BTW, I don't want EFI on this one

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Old 01-24-2013, 04:18 PM
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The link you posted didnt work, but you are correct. If the dizzy has mechanical weights and a vac pot for advance, that is what you want.
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Old 01-24-2013, 04:45 PM
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thanks, but the question still is which dizzy?

I know it has to be an Olds or Caddy pre-ecm distributor and I think it may be the one from the 4.1 Eldorado, but I am not sure. Any help will be appreciated.
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Old 01-24-2013, 04:52 PM
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as long as it has a mech and vac advance it will work. You can put a plain 4 pin module in it with a few mods.
You could almost retro fit a newer one with some older advance mechanisms i would imagine.
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Old 01-24-2013, 05:12 PM
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there is a correct one

I am told there is a model of Olds distributor that the guts of it will slide right into it, with simply cutting the stem a little shorter. But I don't know which Olds engine.
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Old 01-24-2013, 05:23 PM
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you will have to bust out with a few distributors and do some checking.
Joe Padavano is a HR member and a GM afficionado. He would probably know what fits...right off the top of his head.
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Old 01-24-2013, 06:59 PM
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there is the problem

I don't have access to a bunch of distributors to try out. I am a home hotrodder and the advice from someone like Joe would be great. I don't know his forum handle though.

Arn
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Old 01-24-2013, 07:19 PM
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Your thread has a pretty good title. Chances are he will see it and answer.
I couldnt find his exact username for a PM. But his username is what I posted.
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Old 01-24-2013, 07:43 PM
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Let's hope he sees it

I tried Joe Padavano for a PM and no luck
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Old 01-24-2013, 09:33 PM
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Quote:
Originally Posted by Arns85GT View Post
I am doing a build with a Caddy 4.9

This will be a carb'd engine and I will be using a distributor from the older 4.5 version of the engine and no ECM.

I am told I need to use this distributor with the internal mechanism from an older engine to get a free standing weights/vacuum advance. It may be the 4.1 distributor from 1983, but I am not sure and I am looking for advice before I buy.

Does anybody know which older distributor is the proper donor for this modification?

Thanks,

and BTW, I don't want EFI on this one
The Olds 307 was mentioned, but the following link is to a thread that will shed some light on it all. The Fiero forums in general have a lot of Cad info, including non feedback distributor/carb swap.

CARBED 4.9 SWAP INQUIRY - Pennock's Fiero Forum
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Old 01-25-2013, 12:10 AM
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Quote:
Originally Posted by Arns85GT View Post
I tried Joe Padavano for a PM and no luck
I never got the PM. I don't know Caddy motors, but I've never heard of an Olds distributor fitting a Caddy. The only exception is the 76-79 Sevilles and 79 Eldo that used the 350 Olds motor (so obviously an Olds distributor fits those). The Olds uses a hex oil pump drive - all other GM distributors I've seen use a flat blade drive in the distributor gear.

More importantly, the top photo is a Caddy 4.1 distributor, the bottom is an Olds (all 1964-1990 Olds V8s use the same distributor). Do the look like they interchange?



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Old 01-25-2013, 03:39 AM
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The complete distributor isn't used. Parts are mixed/matched. Disassembly/modification required. Not plug and play.
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Old 01-25-2013, 06:36 AM
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I got another answer

A fellow I contacted at the Fiero Forum says I use the internals from a Pontiac v8 301 350 400 or 455. Apparently the internals just slide in.

Thanks for the info Joe, interestingly my Chevy V6 uses a hex drive on the distributor too. That is the 2.8,3.1,3.4 series

I'll keep you posted.

Thanks for the help guys.
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Old 01-25-2013, 02:57 PM
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Joe...you Da Man...
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Old 01-25-2013, 06:14 PM
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Yeah, helpful info... Joe.
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