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63 GMC 305 v-6 distributor question
#1406670 Mon Apr 19 2021 03:19 PM
Joined: Mar 2021
Posts: 10
I have a 63 GMC pickup with a 305, and have noticed there seems to be 2 types of distributors for this engine. Mine has the externally adjustable points (window like v-8 distributors). I think I have seen pictures of other 305s with distributor caps that resemble in line 6 type. Anyone know if there’s a year or model changeover point? Or am I mistaken?

Re: 63 GMC 305 v-6 distributor question
BobShingledecker #1410596 Thu May 20 2021 12:35 PM
Joined: Nov 1995
Posts: 5,143
Unrepentant VW Lover
Bob -- Sorry no one knew the answer to this. It may be an after market cap? My '65 305 did not have that window. Just a straight, solid cap.

How do you get to it??? On my truck, access to the side of the distributor was very limited and made harder by the location of the distributor in the first place. Is the idea that you can adjust the points with the engine running? So you have to lay across a hot, running engine and hope you don't get any flaming backfires through the carb right in your belly? Yikes.


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Re: 63 GMC 305 v-6 distributor question
BobShingledecker #1410604 Thu May 20 2021 12:57 PM
Joined: Apr 2005
Posts: 10,021
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
John, regarding your “How do you get to it” question. Before starting the engine you would raise the side cover of the distributor, it should stay up on its own. Then start the engine and connect up your Dwell/Tach Meter. There was a specialty tool made to insert into the adjustment screw attached to the points. It was a long spring with a screwdriver handle on one end and the proper size Allenhead wrench on the other. A regular Allen wrench could be used but it was a real pain. You would then turn the driver left or right to adjust the points thus setting the dwell. The tool (I still have one) was about 10” long. Then pull the tool and close the little sliding door.

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Re: 63 GMC 305 v-6 distributor question
BobShingledecker #1410674 Thu May 20 2021 08:29 PM
Joined: May 2005
Posts: 8,318
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To follow up, He asked his question over on 6066GMCCLUB and got the answer.

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Re: 63 GMC 305 v-6 distributor question
Justhorsenround #1417555 Tue Jul 20 2021 10:07 PM
Joined: Dec 2018
Posts: 760
Martin over 50 years ago I just made an allen wrench distributor key and carried it with me,adjusted a lot of those.

Re: 63 GMC 305 v-6 distributor question
BobShingledecker #1417566 Tue Jul 20 2021 11:01 PM
Joined: Feb 2004
Posts: 22,979
There's a shade tree trick on those external-adjust distributors when a dwell meter isn't available- - - -with the engine idling, turn the adjustment screw clockwise until the engine stumbles or stalls, then back off 1/2 turn. The dwell is set within specifications. I've also got one or two of those flex cable adjusters stashed away somewhere.

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