• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail
    Owner/Operator

Ignition System Performance Upgrades

towpainter3

Member
Good deal, they are available here in stock from our local speed shop for 36.00 + tax. Pickin one up tonite . Ready to do this shnizz.
 

towpainter3

Member
Ok before I get to deep in this shizz, my 345 has the prestolite electronic diz. Works great. Ready to install the msd 6a got my 8207 coil fabbed up the bracket to mount it.
Now big question. Can I use the prestolite and if so, which wire goes where. Or am I gonna need to switch back to my point diz with the pertronics conversion or the original point diz.
I also want to keep the prestolite cap. I read somewhere it can be indexed by removing the square tab on the inner rim. Correct?
Thanks for the info brad
 

Michael Mayben

IHPA Tech Moderator - Retired & No Longer Online
With the prestolite distributor, the fresh msd coil, and an msd 6 box, you will have everything needed for an ultimate ignition system.

Do not use the white wire coming out of the distributor. The red wire is positive, the brown wire is negative. So wire it exactly as shown in the msd instructions on the last page of the msd instruction set. The red wire will go to the smaller red wire on the msd box, the brown wire will go to the small white wire on the msd box.

If you are using a prestolite cap, on a prestolite distributor, then juts leave the cap alone!
 

towpainter3

Member
Im lovin the word ultimate too!!! We'll know tomorrow how ultimate it is. I'll get her wired up in the afternoon and see what happens. Scored a really cool ol school open air breather set up for 10 bucks and a spacer from a GM TBI that has the pcv breather tube on it , im fuukin stoked. Will let yall know how shes runnin tomorrow. Thanks and have a good nite. I will, im on my 8th shiner bock. Damn they are good. Never tried one til m/m said somethin. Now I know what ive been missin!!! At least they got beer and they death penalty express right in texas!!! Lol
 

towpainter3

Member
Sorry guys didnt get to work on it today maybe tomorrow, had a cataclismic day. Water heater at my 93 yr old grandma's house shot its wad. Blew out the whole side right on the seam, guess I would too after 32 yrs. That just goes to show how well they used to build shit. Had to go and do the r&r deal on that. Gotta love 60 yr old gavanized pipes.
It shouldnt be too bad everthing is already pre mounted from the racecar and the wiring has already been prepped.
 

towpainter3

Member
Ok got her runnin!!! Fires right off cold and runs good. Idle quality seems to have greatly improved and it doesnt run as Rich at idle. Will do some more tuning on her this weekend. Will post numbers then.
I do have to say I checked the spark before adding the msd and coil and it was weak and yellow looking at the plugs. After installing the box and coil. Those plugs make a very healthy and might I say painful blue spark! Gonna play with some ngk plugs and different gaps just to see what happens. Im still open to any thoughts or suggestions too !
Next step will be the addition of a Holley projection setup I obtained through some wheelin and dealin maybe! Im still like m/m I love carbs!!!
 

scoutpappa

Member
ok got her runnin!!! Fires right off cold and runs good. Idle quality seems to have greatly improved and it doesnt run as Rich at idle. Will do some more tuning on her this weekend. Will post numbers then.
I do have to say I checked the spark before adding the msd and coil and it was weak and yellow looking at the plugs. After installing the box and coil. Those plugs make a very healthy and might I say painful blue spark! Gonna play with some ngk plugs and different gaps just to see what happens. Im still open to any thoughts or suggestions too !
Next step will be the addition of a Holley projection setup I obtained through some wheelin and dealin maybe! Im still like m/m I love carbs!!!
Good deal. I'm liking my setup also. Brave man to check that type of voltage even without a load. And if you want to stay with a carb I might know an interested party for the projection :wink5:
 

towpainter3

Member
Ok heres some numbers after doin alittle tuning and some driving. The addition of the msd and coil was a big improver.
345 727 d20 w/409's and 33's thermoquad
680 rpm idle/n
19.5in vac
10deg initial timing on 87 octane alkeegaz
195 deg thermostat

this freakin ol ass piece of junkiron runs like a raped ape!!!!!
Plus I got the a/c workin and its throwin snowballs out the vents.
Thanks for the great write ups and advice!!!

Time to go wheelin and pull some heeps o junk off the mountain!!! They say its a stoneage piece o shit but I always seem to have some kind of new piece of detroit or nagasaki iron on my ass attached with a damn chain lmao
 

rustbeltbinder

New member
Question: I have the Holley distributor with the gold box can I hook up an msd box too it? If not can u recommend what I can do? Its in a 76 Scout II with the 345
 

towpainter3

Member
Find yourself a prestolite with the electronic ignition and get the 8207 msd coil. According to mayben this combo is the ultimate IH ignition. If you cant find one the a point type Holley with a pertronix conversion is the way to go,thus eliminating the pesky gold box and simplifying your ignition setup. Thats my opinion,
hooking up the msd to either of these types is easycheeze!!! And trust me, the set up on mine will flat light you up!!!
 

scoutpappa

Member
I have a mallory unilite dizzy (only direct replacement dizzy but you have to utilize your existing cam gear) I use that to trigger a mallory "6" box (digital) through a "e" coil (non canister oil filled type 60kv). I find this to be an extremely reliable setup, with multi spark capability and no issues with hot starts. I also live in houston and this summer was one level up from hell considering ambient temperature. To put this in perspective this is installed in a 79 Scout II with working a/c, auto trans, that my wife :mad2: drives daily. I maintain a steady 19.5" vaccum and no clue as to advance (it's alot but it's mayben optimized, which means I have never put a light on it to verify). Read through the posts and decide what you want. There are many options available and in most cases they are buildable insofar as you can buy one componant, save up and then get another. Just remember with any setup not utilizing a "6" box you will need a ballast resisteor or a resistance wire between your keyed b+ and the positive terminal on the coil.
 

rustbeltbinder

New member
Thanks guys for the help now I just need to find one of those dist. Got 4 spare motors all with gold box. However I called summit racing and they said the gold box is the same thing as the Ford duraspark I dont know if any of u guys can shed a little light on this subject?
 
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