Which Distributor-Petronics, Duraspark or DUI????

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Since I am replacing my carb in my '67 170 with most likely a Weber 38, based on the great help offered by this sites great members, I need to swap out my Distributor. Now I need everyones assistance again in choosing the best Dizzy that goes with the Weber 38. I assume these are the most popular 3:Petronics, Duraspark or DUI. The engine is a stock 170 from 1967, the only change made to the engine is the Carb.
 
The very best choice would be the DUI from AZ Coupe. Only one wire to mess with. You would never regret it.
 
On the AZ Coupe website, when ordeering the Dizzy, it asks me to choose either the 170 with 5/16" drive or 170 with 1/4" drive. What is it? How do I know which, the 1/4 or the 5/16?
 
You are best placed to verify what is already there, by removing and measuring. Should be the 5/16" shaft but the joke with old Fords is "never say never". :wink:

Also measure the diameter at the pilot tip. Either 0.490 or 0.530 inches - make sure of which it is.
 
67ORANGE_EB":lu1zb6hj said:
On the AZ Coupe website, when ordeering the Dizzy, it asks me to choose either the 170 with 5/16" drive or 170 with 1/4" drive. What is it? How do I know which, the 1/4 or the 5/16?
Click to expand...
A 67 model 170 always will have a 5/16" drive--------unless of course they had an older cam laying around at ford and said hey stick that one in there or some other typically off the wall thing
You are best placed to verify what is already there, by removing and measuring. Should be the 5/16" shaft but the joke with old Fords is "never say never".
Click to expand...
never say always either LOL
 
As to choice, my last choice would be petronics and my first choice would be DUI, my personal choice for now is duraspark for cost reasons. The DUI will end up under my hood eventually. Right now my girlfriend needs a new leather outfit for Daytonna and she has this----oops too much info.
 
I would like to order a DUI now to enjoy the horsepower improvement and lose the load-a-matic, tempermental crap. Problem is, if I have it curved for my current setup, I will have to recurve when future improvements are added (new head, carb, etc.). Am I right??? Would this require sending the unit back to the manufacturer?
 
http://www.kastang.net/pertvds2.html

The eternal debate with no real answer.

It's all preference. Performance wise, they are all much better then points IMO. But that's because I include minimizing maintenance as a performance category.

I prefer DS2 over all of them. I've never tried the DUI from mike and knowing the quality it is up there, so my following statement is made with that in mind. I wanted parts that could be easily obtained over the counter from any generic autoparts store. DUI and Pertronix can not. This all stems from one night when I was 15 miles from home and started having some issues with pertronix. Limped home and then had to wait 4 days for replacements parts. (It was actually partially my fault, it wasn't a Pertronix failure 100%).

But that's because my mustang is a daily driver so I want easy to find parts. DS2 and parts can be found at any auto warehouse or if I'm really hurting just about any junkyard. Part of my personal philosophy for this car. I try to minimize exotic parts. I know, Oz 250 head. It was converted to all US spec valves and gear. Everything. My Disc brakes are coming from a 1965 GT mustang. So, my only exotics are the MSD and the T5 and those aren't too extreme or hard to find.

Slade
 
CobraSix":2q8nxbh6 said:
http://www.kastang.net/pertvds2.html

The eternal debate with no real answer.

It's all preference. Performance wise, they are all much better then points IMO. But that's because I include minimizing maintenance as a performance category.

I prefer DS2 over all of them. I've never tried the DUI from mike and knowing the quality it is up there, so my following statement is made with that in mind. I wanted parts that could be easily obtained over the counter from any generic autoparts store. DUI and Pertronix can not. This all stems from one night when I was 15 miles from home and started having some issues with pertronix. Limped home and then had to wait 4 days for replacements parts. (It was actually partially my fault, it wasn't a Pertronix failure 100%).

But that's because my mustang is a daily driver so I want easy to find parts. DS2 and parts can be found at any auto warehouse or if I'm really hurting just about any junkyard. Part of my personal philosophy for this car. I try to minimize exotic parts. I know, Oz 250 head. It was converted to all US spec valves and gear. Everything. My Disc brakes are coming from a 1965 GT mustang. So, my only exotics are the MSD and the T5 and those aren't too extreme or hard to find.

Slade
Click to expand...


The DUI electronics are GM HEI. Once you purchase the unit, anything that can go wrong is over the counter parts.
 
jahearne":nea6ruf3 said:
The DUI electronics are GM HEI. Once you purchase the unit, anything that can go wrong is over the counter parts.
Click to expand...

Good point...but that's also the one of the things I try to limit, cross manufacturer parts, though if my MSD failed, I'd have to use a GM module to get home that I have in the trunk and the ignition is prewired for it. Same reason I didn't go with a granada swap for disc brakes or a kit that uses GM parts.

Just personal preference, not saying DUI isn't a great choice. I guess to me, when you are dealing with such small amounts of HP, the % gained may be the same as the bigger engines, but real HP gains are much smaller. There is just a point of diminishing returns and for me until I see some good solid numbers otherwise, the DUI doesn't offer that much more then DS2 or Pertronix. I know it's a great product or Mike wouldn't have brought it to us.

Slade
 
Just like stated, they are all good. They are all better than points.

For me at my level of performance, daily driving, it was a no brainer. Pertronix. For $100, it installs in a minute and I haven't touched it since… nearly three years. I know it's a huge improvement, from the moment I touched the key after the install. It was like turning on a light switch! 8)
 
Oh yeah, last night I was reading the new Hot Rod about a junk yard Pontiac engine and how to bring it to life. Basically for $5000, they doubled the power to 500hp.
The point I wanted to make is they chose Pertronix.
 
so...I still have the load-a-matic but I am running the pertronix I. Will I see much difference with the DUI?
 
I'm not saying there isn't a difference, but I'm not sure how noticable. It comes down to personal philosophy. It there is a 5% difference, on a stock 200 that's 3HP. Is 3 HP work $200 to you?

For me, at least at first, I tended to get upgrades that gave me the most HP for the money. Now that I've got the large upgrades done, now it's time to eek out the last few HP from the higher dollar upgrades (DUI, Aluminum Head, etc).

Slade
 
I agree that 3HP is not worth $200. However, if you plan to add aluminum head (when ready) and new carb, I will be ditching the load-a-matic anyway. My thinking was I could stage this out a bit and get some benefit now. We all don't know what the price of Mike's head will be, but putting out for that, a new carb and DUI all at once will be a chunk o change!
 
In that case, I'd reverse it. Get the head and carb first, run with pertronix until you can afford DUI. Save the money, get the big bang first and then the DUI for the final touch later.

Slade
 
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