View Full Version : MSD Distributor -O Rings on Lower Housing
I posed this question on the MSD Forum a week ago and got no reply. So I thought I would try it here. I have an MSD Pro Billet distributor for a small block chev. Here is an excerpt from the installation manual.
https://static1.pt-content.com/images/pt/2008/05/vettemsddistoringinst-1.jpg
I guess that must be a generic drawing because it sure doesn't look like a small block distributor hole. Pictured below.
https://static1.pt-content.com/images/pt/2008/05/vetteenginedistributorshaftholeinb-1.jpg
I am wondering if maybe that drawing is of a Big Block, and also, why you would need to chamfer the bottom of the lower bore as the o-rings don't go down that far.
Hmmmmm. I gave the tech guys at MSD 2 weeks to answer this. Still no reply. Now 2 weeks at Pro Touring. No reply. Maybe it's a stupid question?
And now for some comedy relief.
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68sixspeed
05-28-2008, 05:16 AM
just chamfer the upper bore. Also, On a lot of street motors I've left off the lower o-ring to send some extra oil down to the gear.
Blown353
05-28-2008, 06:04 AM
I've never chamfered a block for an MSD distributor and never cut an o-ring by not doing so.
But like the poster above, I leave the o-ring off the bottom collar and use a triangular needle file to shape a .020" groove into the side of the distributor body to spray oil directly onto the distributor/cam gear-- position the groove directly over the gears once you have the distributor set for proper timing. This was strongly suggested to me by a couple of machinist friends as an "insurance policy" after I ate a distributor gear a couple years ago.
Well, this thread doesn't seem to have capured the hearts of auto enthusiasts around the world, but I will post the reply I got from MSD.
If that is a stock oem block we do not recommend using the o-rings for the fact there is no chamfering done to the block in that area . Dropping the distributor in with the o-rings would only result in the o-rings being pinched off and ending up in the oil pan . After - market blocks typically have that area chamfered and need to have the o-rings placed on the distributor shaft for oiling purposes .
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