Distributer points for 66 big block

[Harry L.]

IN 1966 are all the points the same for Big Blocks, as they are for Small Blocks? thanks DUTCH

[Joe L.]

Re: Distributer points for 66 big block

IN 1966 are all the points the same for Big Blocks, as they are for Small Blocks? thanks DUTCH

Dutch-----


For 1966, all small blocks with breaker point-type ignition used contact set D106P, aka GM #1931988. Big blocks with breaker point-type ignition used contact set D112P, aka GM #1966294.

[Wayne M.]

Re: Distributer points for 66 big block

Dutch-----
For 1966, all small blocks with breaker point-type ignition used contact set D106P, aka GM #1931988. Big blocks with breaker point-type ignition used contact set D112P, aka GM #1966294.

Here's what they look like. Removed from NOS boxes for the photo. The D-112P is on the left; the D-106P on the right. Notice the slot arrangements. The spring tension on the 112's is slightly higher than the 106's. Also (at least on these) the fixed contact (button) on the 106 is larger than that on the 112.

[Harry L.]

Re: Distributer points for 66 big block

Wayne, I purchased my big block points at Napa today which are made by Echlin. I asked if there was a different # for small block points. The points were the same. I called Long Island Corvette and they sell one # set of points for both BB and SB. SO I called Paragon and they sell different points for BBs and SB 66 VETTES. but the Tect Man could not give me the difference between the two. The points I purchased, looks like your picture of the D112P, the slots and all the body features line up.There is copper around the lower outside of the contact leaver. So I guess I will do a little more investigating. Do you have any more advise? DUTCH

[Bill I.]

Re: Distributer points for 66 big block

Also has to do with the spring tension. BB reved higher, hence a higher tension.

[Duke W.]

Re: Distributer points for 66 big block

About that photo, are you sure the spring tensions are different? The only real (long out of production) D112P sets I ever used had the screw terminal The 28-32 oz. spring tension on the D112P set is noticeably more than the 19-23 oz. of the D106P set.

As far as which to use for service, it's a matter of how high the engine will rev. I generally recommend the high breaker arm tension set for engines with redlines over 5500.

Most currently available point sets are made by Standard Motor Products, regardless of brand. From memory the higher breaker arm tension set is Echlin CS86, and Borg Warner D112HP. More complete brand/part number listings are in the archives.

There were various numbers assigned to the standard tension set due to design differences like screw or clip on terminal. Then there was the "uniset" that combined the points and condenser in one unit that I believe can be used in earlier distributors that originally had separate condensers.

Duke

[Larry M.]

Re: Distributer points for 66 big block

The many Delco-Remy D-112P point sets I have installed over the years have all had the spring clip as opposed to the screw terminal. I don't remember any exceptions....although it is certainly possible. This was for Delco-Remy Brand points only....other brands were different.

The Delco-Remy D-106P point sets could be obtained with both the spring clip or screw terminal. The screw terminal was obtained by adding an "S" after the 106P (ie. D-106PS).

Larry

[Wayne M.]

Re: Distributer points for 66 big block

The many Delco-Remy D-112P point sets I have installed over the years have all had the spring clip as opposed to the screw terminal. .......
The Delco-Remy D-106P point sets could be obtained with both the spring clip or screw terminal. The screw terminal was obtained by adding an "S" after the 106P (ie. D-106PS).....

Duke --- to add a bit to what Larry has said, the D106PS part # 1966289 first appears in the 1966 P&A30 Chev parts catalog (with the screw mentioned in the description) Pic of box attached.

In my big photo above, the part #'s for the D112P (left) and the D106P (right) came from boxes with the exact part #'s that Joe L. has mentioned.

There's quite a demand on eBay for the D112P's; pic of a box of 10 with one gone; sold for $280.

Then there's another D106HP #1948671 (pic). Have no idea what this is for as it doesn't show in the P&A catalogs that I have.

Don't know why the higher spring tension D112's should be specified for big block points engines. In the Corvette C2/C3 era, the redlines for hydraulics (ie. mostly non T.I.) were similar, big or small block.