No vac dizzy

[Chevygold]

Hope the experts on here might be able to help me out with my distributor on my truck. The truck came with this fitted and I'm now trying to get the motor to run properly. Motor is a 383 stroker TH400 tranny carb a 670 street avenger, primary seems to be OK now but haven't been for a test run yet as just finished putting it all back together following a bit of a refresh of the body.
So here's where I am now she revs good up to around 5K then strats spluttering and missing, at first thout it was the carb but the mixture was fine running in the 13-14 AFR so thought I'd take a look at the distributor, with the cap off it was clear the contacts in the cap were badly in need of a clean so they were all cleaned along with the centre button in the cap, the spring contact on the rotor and the side contact, refitted the cap and it was better but still not great so started to think maybe timing as I've never touched it. I think it's a later HEI dizzy can't see any markings other than Delco-Remy and Made in USA the top of the cap is marked LATCH at both sides of the flat area on the top which I take it is to clamp the adaptor for the diagnostic gear which I have. One thing I noticed a while back is the lack of a vacuum capsule but just assumed it was taken care of electronically? the other find was a four way lead ending in a plug which is just hanging, wire colours are Yellow, (could be white?), Pink/white, Brown/black and Black, should this be plugged in somewhere? So without a vacuum unit what do I set the timing at, abot 35 all in?
Sorry for the long post but wanted to give as much info to help, truck is a 1976 C10 longbed.
Thanks all
Graham

[Chevygold]

76 C10 longbed 383 stroker with TH400 tranny.
Trying to get my truck running better after a bit of body TLC, been playing with the carb to get decent combustion AFR and think it's OK on the primary now although still need to put the new carpet in and the seat before I can give it a road test!
After deciding maybe it was an ignition fault so opened up the dizzy and found the contacts in the cap in a bad way, set to with some wet n dry and got them looking good, gave the centre contact a clean as well while I was there, also cleaned the rotating contact and centre spring contact on the rotor.
Put it all back and it was better but still misfired above 5K revs so wondered if it's maybe the timing which I haven't touched since I got the truck.
Anyway the dizzy doesn't have a vacuum unit fitted which I've never really give much thought to until now so how do I time it? 35degrees all in maybe? Other than Delco-Remy and Made in USA I can't find any numbers on the dizzy, also there is a 4 way connector attached 4 wires yellow (or white?), pink/white, brown/black and black, pictures attached, should this be plugged into something which I don't have?
Thanks
Graham

[VileZambonie]

Dizzy's are for Honda boys. Swap out a vacuum advance HEI in place of your "dizzy"

[Chevygold]

Hi Vile could it be the vacuum unit has just been removed for some reason? If it stops raining tomorrow I'll see what the timing is now and post what I got.

Graham

[VileZambonie]

I'm going to guess someone swapped that in once upon a time.

[Chevygold]

Put the timing light on and firing at TDC at idle, which I think went to 6 degrees max when revved, that might be wrong as I left the bit of paper in the garage when it started raining again!!
Anyway set it to 35 degrees all in and it seems to run OK but still have the misfire above about 5K.
I've ordered  a Moroso adjustable vacuum unit and a Proform ignition module, once they arrive I'll pull it and rebuild it with the vacuum can first and see what it's like but I suspect the module is on its way out, I always try to do just one thing at a time otherwise you never know where the fault was.
I have my Snap on analyser all ready to put on and see what that tells me but we've just had a thunderstorm with hailstones so not going out there again just yet!!
Will update once I get back to it.
Thanks
Graham

[Chevygold]

Quick correction on my previous, timing was TDC then 11 degrees all in at 3500 revs +, so mechanical advance is 11 degrees, does that sound about right?
When I fit the vacuum unit how many degrees should the vacuum add to the plot? Thought I'd connect my vacuum pump to the unit for setting purposes?
Thanks
Graham

[JohnnyPopper]

Knew dizzy would trigger someone...

You can add VW kooks to that group 

Is there an acceptable acronym for distributor? 

[bd]

Is there an acceptable acronym for distributor? 

Yeah!  I think it's, "distributor."   

[JohnnyPopper]

Very funny bd

How about 'dist'?

What other system uses the word except for fuel, and vaguely at that?

Oh, and the VW kooks are like the Honda boys, if there was any confusion. They Love them some 'dizzys'!

[Chevygold]

Just to update I now have a new cap and ignition module, vac unit on back order so once I have that I  can get started but in the meantime either my ignition switch or inhibitor has gone bad as I can't get a crank, the joys!
Graham

[VileZambonie]

Vacuum unit? Why not just get a new vacuum advance distributor?

[Chevygold]

Hi Vile, mainly cost, living in the UK I don't have access to such things at a reasonable cost and I'd rather stay with the original Delco Remy item rather than go with one of the Chinese copies.

Graham

[VileZambonie]

Well what you have in there does not look like the correct distributor to begin with. Is that all you can get there is Chinese?

[JohnnyPopper]

I noticed that too but thought the pic got squashed, but looking again, it looks like it's much shorter than a stock distributor.