Mallory unilite dist - Team Camaro Tech
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post #1 of 32 (permalink) Old Nov 12th, 19, 06:20 PM Thread Starter
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Question Mallory unilite dist

Wondering what people's thoughts are on these distributors. It's the mallory unilite with vac advance. I've used one in the 327 for 22 years and haven't had any problems with it.
Running another one just like it in the 427 I just installed. In trying to dial in the 427, ( timing and carb adjustments), I set my initial to 18*. Motor likes it. But after I plug in my vac advance, ( to constant vac), I get a reading of 45*. At 2200 + it runs up to 55. Not sure if these dist. have an adjustment inside or not. And, I am using a dial timing light. LOL
I've been reading on how many guy's hate the dial timing lights. But hell, how would I have ever seen 55* without it. LOL
Anyone well versed on the mallory?

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post #2 of 32 (permalink) Old Nov 12th, 19, 07:40 PM
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It’s been 30yrs since I had one. I remember the advance springs being a pain to get too. That’s about it.

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post #3 of 32 (permalink) Old Nov 12th, 19, 08:36 PM
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Re: Mallory unilite dist

Sounds like you need to install a positive stop on your vacuum advance can to keep your total advance within more reasonable limits; 45 sounds high. Search for postings by Dave Ray concerning distributors, vacuum advance and dial-back timing lights.

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post #4 of 32 (permalink) Old Nov 12th, 19, 08:44 PM Thread Starter
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Re: Mallory unilite dist

Yeah, I agree. Caps gonna get popped off. I'll peek inside to see what I can see. LOL

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #5 of 32 (permalink) Old Nov 13th, 19, 07:25 AM
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Re: Mallory unilite dist

I had no problem with mine but I did not hook up vacuum.

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post #6 of 32 (permalink) Old Nov 13th, 19, 07:48 AM
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Re: Mallory unilite dist

Quote:
Originally Posted by stevo camaro View Post
Wondering what people's thoughts are on these distributors. It's the mallory unilite with vac advance. I've used one in the 327 for 22 years and haven't had any problems with it.
Running another one just like it in the 427 I just installed. In trying to dial in the 427, ( timing and carb adjustments), I set my initial to 18*. Motor likes it. But after I plug in my vac advance, ( to constant vac), I get a reading of 45*. At 2200 + it runs up to 55. Not sure if these dist. have an adjustment inside or not. And, I am using a dial timing light. LOL
I've been reading on how many guy's hate the dial timing lights. But hell, how would I have ever seen 55* without it. LOL
Anyone well versed on the mallory?
I have one and Holley still has the instructions for installing one.
https://documents.holley.com/mallory...7_38_45_47.pdf

They are supposed to have 24 degrees mechanical advance. They recommend setting initial at 12 degrees (12 + 24 = 36 total)

The vacuum can should add around 15 degrees. You can add a stop to tailor how much advance it adds; most people recommend 10 degrees

If you raise the initial to 18, you should lower the mechanical to 18 to keep 36 total.

They sell an advance curve kit; I haven't had a chance to try it :

https://www.summitracing.com/parts/maa-29014/

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post #7 of 32 (permalink) Old Nov 13th, 19, 05:41 PM Thread Starter
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Re: Mallory unilite dist

I looked inside this unit and there's no mechanical advance at all. No springs. Just the vac. rod. Someone said I shouldn't disconnect the vac advance while timing this type of dist. Time it plugged in. I'll give that a try and see what happens.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #8 of 32 (permalink) Old Nov 13th, 19, 07:24 PM
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Re: Mallory unilite dist

Without any centrifugal advance how is it gaining 10* at 2200+ rpm? Is this an older unit
somebody could have messed with? If you set the timing with vac advance connected what
are you going to set at? If you set at or around 18* your true initial will be badly retarded
won't it? Something just seems off to me.

Al

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post #9 of 32 (permalink) Old Nov 13th, 19, 08:21 PM
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Quote:
Originally Posted by stevo camaro View Post
I looked inside this unit and there's no mechanical advance at all. No springs. Just the vac. rod. Someone said I shouldn't disconnect the vac advance while timing this type of dist. Time it plugged in. I'll give that a try and see what happens.
That’s what I mentioned in my post above.
If you just popped the cap off, you’re not there yet.

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post #10 of 32 (permalink) Old Nov 13th, 19, 08:52 PM Thread Starter
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Re: Mallory unilite dist

No, I pulled the rotor and trigger plate too. There's nothing else in there but the module and vac advance rod attached to the plate. Plate moves freely. It was new in the box. I'd say it's about 15 years old now. Looks like this dist. gets all it's advance from vac.
Talking to a guy today, who's a mechanic by trade, say's I need to leave the vac hooked up to get the initial on this type. Really? I've never done that before.
I'm going to look at the one in the 327 tomorrow. There's probably a difference between the 2 somehow.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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post #11 of 32 (permalink) Old Nov 13th, 19, 09:13 PM
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Re: Mallory unilite dist

Sounds to me like it's only going to work correctly with ported vacuum then. I know
very little about the unilite but I do know they've gone though variations over the years.

Al

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post #12 of 32 (permalink) Old Nov 13th, 19, 10:35 PM
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Like I said, it’s been a long time, but I remember removing the C clip on the vac advance and removing the advance plate to get to the springs underneath. They’re dow deep in the body. It sucked. I had extre C clips cause I’d loose them.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
Global West arms
Budnik wheels

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post #13 of 32 (permalink) Old Nov 14th, 19, 06:14 AM
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Re: Mallory unilite dist

Mechanical advance is under the plate. You have to disassemble the dizzy to get to it. remove gear and pull the shaft. Go to the holly website click Mallory Unilite and download the manual.

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post #14 of 32 (permalink) Old Nov 14th, 19, 08:48 AM
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Re: Mallory unilite dist

SteveO I had that same dist. in my 69. Here are the issues I had with mine. Previous owner had put the wires to close to the shaft, it rubbed through and grounded them to the shaft intermittently. Car would occasionally buck and snort and stop cold turkey. Then start up again.That sucks. I took it apart, it was dirty, cleaned it up and bought a new module kit and got the Vac arm put back onto the pin again and then things ran much better
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post #15 of 32 (permalink) Old Nov 14th, 19, 09:36 AM
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Re: Mallory unilite dist

Quote:
Originally Posted by click View Post
SteveO I had that same dist. in my 69. Here are the issues I had with mine. Previous owner had put the wires to close to the shaft, it rubbed through and grounded them to the shaft intermittently. Car would occasionally buck and snort and stop cold turkey. Then start up again.That sucks. I took it apart, it was dirty, cleaned it up and bought a new module kit and got the Vac arm put back onto the pin again and then things ran much better
I remember having to do that same fix, If you take that plate out underneath all that are the advance springs.

I was so glad when I replaced that thing.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
Global West arms
Budnik wheels

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