Delco distributor cap....what goes here?

[Michael G.]

This evening I pulled out an NOS Delco distributor cap (purchased years ago) to use on my latest project. Immediately noticed some differences as compared to another Delco Remy cap I have. Both say "Delco Remy, patient pending, R". The NOS cap has different contact material and pin height is shorter than the other cap. Could the NOS cap be a fuelie cap? What goes here?
NOS is on the left.

[Michael G.]

Re: Delco distributor cap....what goes here?

Don't worry about it, just send it to me and I'll send you back one with higher terminal bosses...

[Michael G.]

Re: Delco distributor cap....what goes here?

Mike,

What are you saying. Tell me about this NOS cap

[Joe L.]

Re: Delco distributor cap....what goes here?

Mike,

What are you saying. Tell me about this NOS cap

Michael------


It could be a D-310, aka GM #1943047. This cap was used for 1963-65 Corvettes with FI as well as 1959-64 Oldsmobiles. I was not aware that some of these caps had the "R" on them, though. Do you have the Delco box the cap was supplied in?

I THINK it could also be a D-311 or D-325 cap used on some Cadillacs.

[Stuart F.]

Re: Delco distributor cap....what goes here?

I'd settle for the one on the right with copper terminals.

Stu Fox

[Mike Z.]

Re: Delco distributor cap....what goes here?

Checked my Delco blueprints (copies)-was curious about the copper terminal cap in black vs. brown.

In all 67 and very early 68 dates of drawings I find OEM P/N #800061, primarily used on the L-88, was "Brown" in color and had copper terminals. Then in the 69 dated drawings, the same P/N, still used the copper terminals, but now was "Black". Don't know the NOS P/N you have, but it appears was based on the #800061 for Hi Performance applications.

Both the FI cap and the copper cap would have been manufactured after 69, based on the "R". Interesting footnote: the Delco drawings do not show the "Patent Pending" on either non-"R" or "R" versions-thought that was interesting.

Mike Zamora
#12455

[Michael G.]

Re: Delco distributor cap....what goes here?

Michael------


It could be a D-310, aka GM #1943047. This cap was used for 1963-65 Corvettes with FI as well as 1959-64 Oldsmobiles. I was not aware that some of these caps had the "R" on them, though. Do you have the Delco box the cap was supplied in?

I THINK it could also be a D-311 or D-325 cap used on some Cadillacs.

Joe,

1943047 is the number on the box.....purchased back in the 90's, in the box since. Have been waiting for a project to use on. Apparently that's all changed now as I'm restoring a '66 BB roadster. Why on this particular Delco cap is pin height shorter than the standard Delco cap?

[John D.]

Re: Delco distributor cap....what goes here?

The part drawing for 1943047 drawn in 1955 shows it was originally used for distributor 1110931. A quick web search reveals that distributor was used on a 59 Oldsmobile.........

[Joe L.]

Re: Delco distributor cap....what goes here?

Joe,

1943047 is the number on the box.....purchased back in the 90's, in the box since. Have been waiting for a project to use on. Apparently that's all changed now as I'm restoring a '66 BB roadster. Why on this particular Delco cap is pin height shorter than the standard Delco cap?

Michael------


That answers a lot of questions. Apparently, the "R" (and PRESUMABLY whatever changes to the cap that the "R" signified) were added to the D-310 cap without the Delco designation changing to D-310R and without the GM part number changing from 1943047.

However, I don't think that ANY D-310 cap ever originally installed on a car would have had the "R" embossment.

[Michael G.]

Re: Delco distributor cap....what goes here?

Michael------


That answers a lot of questions. Apparently, the "R" (and PRESUMABLY whatever changes to the cap that the "R" signified) were added to the D-310 cap without the Delco designation changing to D-310R and without the GM part number changing from 1943047.

However, I don't think that ANY D-310 cap ever originally installed on a car would have had the "R" embossment.

Joe,

You mentioned the use of this cap on the 63-65 fuelie Corvette. What is the significance of the pin height being shorter than a standard Delco cap?

[Joe L.]

Re: Delco distributor cap....what goes here?

Joe,

You mentioned the use of this cap on the 63-65 fuelie Corvette. What is the significance of the pin height being shorter than a standard Delco cap?

Michael-----


The FI distributor used a spacer between the distributor and the manifold. This caused the distributor to rise higher. As a result, interference with the 63-65 top distributor shield and the plug wire distributor end boots would occur. The shorter overall height of the D-310 cap compensated for this and prevented interference.

[Peter L.]

Re: Delco distributor cap....what goes here?

Joe - I've had several of these D-310s w/ the embossed R NOS in Delco-Remy pull string boxes and all were p/n 1943047 and there were no indications, such as D-310R, on the boxes that the caps had the embossed R. The NOS D309R I have that is embossed w/ PATENT PENDING R has p/n 800061 on the box. Pete

[Wayne M.]

Re: Delco distributor cap....what goes here?

....It could be a D-310, aka GM #1943047. This cap was used for 1963-65 Corvettes with FI as well as 1959-64 Oldsmobiles. I was not aware that some of these caps had the "R" on them, though. Do you have the Delco box the cap was supplied in? ...

Joe, others -- here's an eBay D-310 short tower FI cap with what looks like its original red/white/blue pull-string box (not the earlier orange black white). It has the "R".

http://cgi.ebay.com/ebaymotors/NOS-DISTRIBUTOR-CAP-63-64-CORVETTE-W-FI-FUEL-INJECTION-/290461416076?pt=Motors_Car_Truck_Parts_Accessories

[Michael J.]

Re: Delco distributor cap....what goes here?

The '66 judging manual states that the caps with any "R" (Patent Pending R or Patent 2769047 R) are later replacement style caps, not original style.

[Ronald L.]

Re: Delco distributor cap....what goes here?

What's really interesting is that it took 13 years to add the patent number to the cap? Patent 2769047 was filed in 1953 and issued in 1956.

And my understanding of those caps holding the patent number were 68 68 caps. The R was added in 1971. Patent pending was 1956 - 1967.

There may be other opinions - be interesting to see.