mopowers
Well-Known Member
How much mechanical advance does a stock '79 360 mopar electronic distributor allow in stock form without tweaking the advance slots? Were any of them different???
Distributor Mechanical Advance
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TrailBeast
AKA Mopars4us on Youtube
The standard Mopar electronic is capable of approx. 25 degrees mechanical average from what I have seen, and they do have different top shafts that determine that.
They are marked on the bottom side of the part with the slots for the weights.
This is why they need to be limited to use a higher initial timing.
They are marked on the bottom side of the part with the slots for the weights.
This is why they need to be limited to use a higher initial timing.
kiss
Well-Known Member
Get the slot plate from FBO ignition to make it easy on yourself. Assuming it's a street car here, if you don't limit the mechanical advance, you'll have to run less initial and your car will have trouble getting out of it's own way. If you run enough initial with a stock distributor you will ping, and ping often!
mopowers
Well-Known Member
Great info. Thanks! I wonder how many shafts with different length slots mopar made???
I'm fully aware of that plate and how to limit advance to run more initial. I was simply asking how much advance the slots in stock distributors allow.
TrailBeast
AKA Mopars4us on Youtube
How many I don't know, but if I remember right the most common one I have seen is marked 11 which would be 22 at the crank.
itate
Where is that wrench I just had in my hand?
I have one that has 13 stamped on it but I don't know what year it's from.
mopowers
Well-Known Member
I had no idea they were even marked. Good stuff. Thanks again.
Really depend on the distributor itself each number is different, your FSM should have a list of all the numbers and the specs for each. I have realy been getting into these lately since I picked up a distr. tester.
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Inside under the plat will have the year stamped and a bar with boxes filled for the month.
itate
Where is that wrench I just had in my hand?
It was in a box of distributor guts so I dug around and found the housing. it's from May 1970.
Thanks for the tip!
ok now look up specks for 70 and you should find which one it is with the mechanical weight numbers.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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I have seen cams from 7 to 15 in 2* increments, and some with angled slots. I haven't seen every one mind you. 13s and 15s I think I have seen the most of.
I drilled and tapped the top of my driveshaft and threw that flipping little wire retainer away. Now I can swap cams almost as fast as someone using the FBO plate. And I have a few custom cams I brazed up.
I drilled and tapped the top of my driveshaft and threw that flipping little wire retainer away. Now I can swap cams almost as fast as someone using the FBO plate. And I have a few custom cams I brazed up.
Mechanical advance also depends whether it was high performance or not. The straight slots were HP Prestolites from what I've seen.
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d55dave
Well-Known Member
Drill and tap. Good idea, I like it!
itate
Where is that wrench I just had in my hand?
My old Chilton book goes from 63 to 70 and some are listed as low as 5.5 to as high as 22.
Old hemi's were very short.
d55dave
Well-Known Member
Has anyone ever compared, are big block and small block interchangeable?
65Val
Average Length Member
Dave...I would think not as BB and SB dizzys rotate in opposite directions.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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The cam part looks the same to me. I think the reluctor just needs reindexing. The driveshafts are different tho
d55dave
Well-Known Member
Kind of what I was thinking. Yes, to slots in the reluctor, one each for cw and ccw rotations. Vacuum cans, shafts, weights etc are different for sure. I have just never compared the advance slot shaft.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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The flyweight pivot pins are reversed, and I seem to remember that the drive key was indexed quite a bit different.
The slotted mech advance are interchangeable between all the 8 cyl, looks like the b/rb housings are the same just the shafts are different.I was just looking at them the other day, I think even the slant ones are the same will compart them next time one is apart to recondition.
ir3333
Well-Known Member
if you have the piece in question stick it in and check it with a timing light,or you'll have to look at the advance plate as has been mentioned.
I have to take some pics, seems the angled ones are the ones over 14 or so, just pulled one out of a junker that is marked 18, that is 36 at the crank with no vac advance!
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